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Category: Publications

Temblor Articles

Figure 1. Seismotectonics of the Philippine Fault showing the location and focal mechanisms of more than 60 earthquakes with magnitudes of 5.0 or greater occurring in the last 52 years. Data sources: Jarvis et al., 2008 for SRTM topography; Weatherall et al., 2020 for bathymetry; GCMT, USGS and PHIVOLCS for earthquake data. The Generic Mapping Tool (Wessel and Smith, 1995) was used to generate the map. Credit: Aurelio et al., 2025 CC BY-NC-ND 4.0
Earthquake Insights / Expert Commentary / Publications / Temblor

Beware quiet segments of the Philippine Fault

Although scientists were not entirely surprised by the magnitude 7.7 earthquake that struck Myanmar on March 28, 2025, the event is a stark reminder that similar active structures exist — …

Figure 1. Damage to buildings within the Swayambhu Temple complex, known colloquially as the Monkey Temple. Damage at the site may have been exacerbated by amplification of seismic waves (topographic amplification) associated with the small hill on which the complex was built (Sánchez-Sesma, 1993). The top of the hill is about 75 meters above the adjacent valley. Credit: Susan Hough, U.S. Geological Survey, public domain
Earthquake Insights / Expert Commentary / Publications / Temblor

Destruction and Transformation: Lessons learned from the 2015 Gorkha, Nepal, earthquake

By Surya Narayan Shrestha (National Society for Earthquake Technology, Kathmandu, Nepal) and Susan E. Hough (U.S. Geological Survey, Pasadena, California. USA)   Citation: Narayan Shrestha, S. and Hough, S.E., 2025, …

Figure 1. Location of magnitude 5 and greater earthquakes (stars, 1937 - present, N=51) in southern California. Notice how the Julian earthquake (red star) occurred in a region that historically did not host large earthquakes. Highlighted are the Elsinore (green), Laguna Salada (brown), and Whittier (light blue) faults. The San Andreas fault runs on the east side of the Salton Sea. The San Jacinto fault is sandwiched between the San Andreas and Elsinore faults. Credit: Kilb et al., 2025, CC BY-NC-ND 4.0
Earthquake Insights / Expert Commentary / Publications / Temblor

Knock, knock, knocking on your door – the Julian earthquake in southern California issues reminder to be prepared

Minimal damage from the Julian earthquake should result in maximum earthquake preparedness efforts.   By Debi Kilb (Scripps Institution of Oceanography at UCSD), Alice-Agnes Gabriel (Scripps Institution of Oceanography at …

Figure 1. The April 23 magnitude 6.2 earthquake struck along the central portion of the Marmara Fault, which was also the site of large shocks in 1509 and May and August 1766. The recent event is surrounded by ruptures of large shocks in 1912 (Aksoy, 2021) and 1999 (Parsons, 2004). Credit: Temblor, CC BY-NC-ND 4.0
Earthquake Insights / Expert Commentary / News / Publications / Temblor

A magnitude 6.2 quake strikes the Marmara Fault at site of large historic earthquakes near Istanbul

The 23 April 2025 earthquake appears to have ruptured a 20-kilometer-long section of the Marmara Fault, near the site of a 2019 magnitude 5.7 shock. Previous major events include earthquakes …

Earthquake Insights / News / Publications / Temblor

One-month earthquake forecast for western Myanmar following the devastating magnitude 7.7 Mandalay shock

Our short-term forecast suggests that between now and May 1, between 1 and 4 shocks greater than or equal to magnitude 4.0 are expected — fortunately a low rate. Much …

Figure 1. The magnitude 7.7 Mandalay earthquake appears to have struck on the right-lateral Sagaing fault. To the south, a magnitude 6.4 aftershock struck about 11 minutes later. Credit: Temblor, CC BY-NC-ND 4.0
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Magnitude 7.7 earthquake strikes near Mandalay, Myanmar

A relatively shallow right-lateral earthquake rocked Myanmar and other parts of southeast Asia, causing damage and death.   By Ross S. Stein, Temblor, Inc., and Shinji Toda, Tohoku University   …

Figure 1. Less than ten days after the earthquake, Aholotu Palu, CEO of Pacific Catastrophe Risk Insurance Company (at left), handed the check to Hon. Charlot Salwai Tabimasmas, Prime Minister of Vanuatu (at right). Credit: PCRIC, used with permission
Earthquake Insights / Expert Commentary / Publications / Temblor

2024 Vanuatu earthquake triggered rapid insurance payout for emergency response

Much of the world lacks earthquake insurance, but when a magnitude 7.3 earthquake struck Vanuatu, the Pacific island nation was protected.   By Ross S. Stein and Gabriel Lotto, Temblor, …

A view of San Francisco taken from the bay. Credit: Slyronit, CC BY-SA 4.0, via Wikimedia Commons
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Anatomy of a tsunami warning

A December 2024 earthquake that occurred off California’s coast highlights concerns surrounding how tsunami risk is communicated.   By Rebecca Owen, Science Writer (@beccapox.bsky.social)   Citation: Owen, R., 2025, Anatomy …

This screenshot of an EarthquakeSim video shows a building falling over in a simulated earthquake. Credit: EarthquakeSim Youtube channel
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Simulating Destruction: Building Virtual Earthquakes

EarthquakeSim’s YouTube channel has gone viral by exploring how visual storytelling could help disaster preparedness.   By Lauren A. Koenig, Ph.D., Science Writer (@Lauren_A_Koenig)   Citation: Koenig, L.A., 2025, Simulating …

2023 team photo. Credit: Andy Castaldi
Earthquake Insights / Publications / Temblor

Temblor, Inc. celebrates 10th anniversary

Catastrophe risk company celebrates a decade of helping the world understand earthquake risk.   By Megan Sever, Editor-in-chief, Temblor Earth News     On December 17, 2024, a magnitude 7.3 …

Figure 1. Aftershocks of the mainshock reveal rupture on the Mendocino Fault, which connects to the San Andreas and Cascadia megathrust at the tectonic triple junction. The earthquake epicenters were obtained from the USGS catalog at 9:00 a.m. Pacific time on Dec. 7. The inset includes red stars locating the magnitude 7 epicenter and the magnitude 5.8 Yerington earthquake that struck Nevada several days later. Credit: Temblor, CC BY-NC-ND 4.0
Earthquake Insights / Publications / Scientific Reports / Temblor

Did the 2024 magnitude 7.0 Cape Mendocino earthquake trigger aftershocks on the San Andreas?

Coulomb stress calculations and the distribution of aftershocks indicate that the early December magnitude 7.0 earthquake likely stressed the northern tip of the San Andreas, near the end of the …

Figura 5: Mapa mostrando la distribución espacial de sismos sentidos en Costa Rica entre el 2010 y 2023 con magnitudes mayores o iguales a 6.0. El tamaño y color de los círculos indican su magnitud y profundidad, respectivamente. Créditos: Chaves, 2024, CC BY-NC-ND 4.0
Earthquake Insights / Expert Commentary / Publications / Temblor

El catálogo sísmico de Costa Rica desmiente un mito popular

El análisis de 14 años de registros sísmicos revela que estos eventos no son estacionales   Por Esteban J. Chaves, Observatorio Vulcanológico y Sismológico de Costa Rica, OVSICORI, Universidad Nacional …

Figure 5. Map showing the distribution of earthquakes felt in Costa Rica between 2010 and 2013 with a magnitude greater than or equal to 6.0. The size and color of the circles indicate their magnitude and depth, respectively. Credit: Chaves, 2024, CC BY-NC-ND 4.0
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Costa Rica’s digital earthquake catalog quashes a common misconception

Analysis of 14 years of earthquake records reveals that these events aren’t seasonal   By Esteban J. Chaves, Ph.D., Volcanological and Seismological Observatory of Costa Rica OVSICORI, Universidad Nacional   …

Vista aérea de la Ciudad de México. Créditos: Edmund Garman, CC-2.0-Generic, vía Wikimedia Commons
Discoveries / Earthquake Insights / Publications / Temblor

Los sistemas de alerta temprana de terremotos pueden ayudar a los hospitales, siempre y cuando estén preparados

Para aprovechar el valioso tiempo que brindan los sistemas de alerta temprana, los hospitales deben desarrollar protocolos de respuesta ante terremotos meticulosamente elaborados.   Por Montana Denton, Temblor science writing …

An aerial view of Mexico City. Credit: Edmund Garman, CC-2.0-Generic, via Wikimedia Commons
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Earthquake early warnings can help hospitals — if they’re prepared

To take advantage of the valuable time given by early warnings, hospitals must develop meticulous earthquake response protocols.   By Montana Denton, Temblor science writing extern (@montana_denton)   Citation: Denton, …

Italy has seen the lowest decrease in EQFL over the last five centuries due to its aging build-ings, like this medieval basilica in Norcia, which crumbled when an earthquake struck the re-gion in 2016. CC0 Public Domain.
Discoveries / Earthquake Insights / Publications / Temblor

A new metric shows which countries experience disproportionate earthquake casualties

A new system for cataloguing earthquake fatalities suggests that five countries have suffered the greatest loss of life over the past 500 years.   By Rebecca Owen, Science Writer (@beccapox) …

Figure 3. The rupture areas of California’s three largest transform earthquakes — the 1857 and 1906 San Andreas shocks, and the 1872 Owens Valley shock — are all seismicity holes (shaded in purple), evidence that these faults are far from static failure today. The first panel is “complete” (meaning that all shocks greater than magnitude 6 have been reliably detected) for California. The second is “complete” worldwide for earthquakes greater than or equal to magnitude 4.4 since 1994, so this map could be compared to a ruptured transform anywhere in the world. Credit: USGS base map with Temblor annotation
Earthquake Insights / Publications / Scientific Reports / Temblor

Why do the largest continental earthquakes nucleate on branch faults?

New research suggests branch faults serve as on-ramps to major fault superhighways. The key to this phenomenon might be that the branch fault ruptures faster than seismic waves can travel …

Figure 2. A coconut tree in Palanas, Masbate, located at the middle portion of the onshore segment of the Masbate segment of the Philippine Fault, was left-laterally displaced by the 2003 magnitude 6.2 and the 2020 magnitude 6.6 earthquakes. The left photo was taken by the DOST-PHIVOLCS QRT after the 2003 earthquake, whereas the right photo was taken during the DOST-PHIVOLCS-led field investigation after the 2020 earthquake. Credit: Left photo from 2003 DOST-PHIVOLCS QRT report, right photo from Llamas et al. (2021), annotations by Llamas and Aurelio, 2024
Earthquake Insights / Expert Commentary / Publications / Temblor

Two strong earthquakes separated by 17 years strike the same fault

As we reflect on the fourth anniversary of the 2020 Masbate earthquake, a coconut tree underscores the significance of short recurrence intervals and precise locations of fault ruptures.   By …

Figure 1a. Seismotectonics of the magnitude 6.8 earthquake of August 3, 2024 in the province of Surigao Del Sur, Mindanao (southern Philippines) in relation to the magnitude 7.4 earthquake of December 3, 2023 in the same province. The result of Coulomb Stress Transfer (CST) modeling is shown. In this model, the fault that generated the magnitude 7.4 earthquake of December 3, 2023 serves as source fault (thrust mechanism) and the fault that generated the August 3, 2024 earthquake serves as receiver fault (thrust fault mechanism). Focal mechanism solutions of the August 2024 mainshock and six succeeding aftershocks with magnitudes ranging from magnitude 4.8 to 6.2, and other post-mainshock events of lower magnitudes (small circles) are shown. Location of cross section in Figure 1b is shown (A-A’). Data: Jarvis et al., 2008 for SRTM topography; Weatherall et al., 2020 for bathymetry; Toda et al., 2011 for CST modeling; PHIVOLCS for earthquake data. GMT (Wessel and Smith, 1995) was used to generate the map. Credit: Aurelio and Catugas, 2024, CC BY-NC-ND 4.0
Earthquake Insights / Expert Commentary / Publications / Temblor

Earthquake model successfully forecasts location of August 3 magnitude 6.8 event

The earthquake that struck offshore eastern Mindanao in the southern Philippines on August 3, 2024 resulted from renewed movement of an extinct fracture zone subducting into Earth’s mantle. That movement …

Figure 7. We calculate that the magnitude 7.1 event brought the southwest edge of the 1946 rupture surface just 0.01 bar closer to failure. This is a negligible amount. In an attempt to be as realistic as possible, here we are calculating the stress in the local fault slip direction (‘rake’) in the rupture model of Kato and Ando (1997). The red halo around the 2024 shock results from the stress increases on adjacent thrust faults. Credit: Temblor, CC BY-NC-ND 4.0
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Japan’s magnitude 7.1 shock triggers megaquake warning. How likely is this scenario?

The largest shocks in the Nankai subduction zone range between magnitude 8 and 9 and occur every 100 to 200 years. But, the recent magnitude 7.1 shock occurred in a …

Map showing location of Cascadia subduction zone. Credit: Temblor, CC BY-NC-ND 4.0
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A clearer picture of Cascadia emerges from modern mapping

Information gathered during a 2021 marine research expedition offers insight into the possible behavior of the Pacific Northwest’s most enigmatic fault.   By Rebecca Owen, Science Writer (@beccapox)   Citation: …

The Lake Mjøsa Skyscraper in Brumunddal, Norway, is built of cross-laminated timber, a type of mass timber. Credit: NinaRundsveen, CC BY-SA 4.0 via Wikimedia Commons
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Structures can be both earthquake-resilient and sustainable

Several studies show that constructing safe structures in earthquake-prone regions can be accomplished using sustainable materials that range from mass timber to recycled tires.   By Alice Turner, Simpson Strong-Tie …

Figure 1: Seismotectonics of Central Philippines. Past Palawan earthquakes are plotted. The largest event on record that occurred near Palawan is the 1940 magnitude 5.9 earthquake (unfilled circles). Other notable earthquakes that affected Palawan are also shown (yellow stars), including the 1897 magnitude 7.5 earthquake and the 1940 magnitude 6.8 earthquake. This map highlights the rare occurrence of earthquakes in Palawan relative to the other parts of the Philippines. The dashed line represents the transect of the seismic reflection profile shown in Figure 3. Inset: EP - Eurasian Plate, PMB - Philippine Mobile Belt, and PSP - Philippine Sea Plate. Data sources: Historical earthquake locations from SEASEE (1985) and Bautista and Oike (2000); instrumental earthquake locations from PHIVOLCS, ISC, and NEIC; focal mechanisms and location of active faults and trenches from PHIVOLCS; and SAR-derived topography and high-resolution bathymetry from NAMRIA (2013).
Earthquake Insights / Expert Commentary / Publications / Temblor

Earthquakes rattle Palawan, Philippines: Is the region as stable as we thought?

The Philippine island of Palawan — considered a stable part of the seismically active country — was recently shaken by two earthquakes in two days, highlighting the need to reassess …

An aerial view of Los Angeles. Credit: Tuxyso, CC BY-SA 3.0 , via Wikimedia Commons
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Seismic retrofit rates highlight inequitable efforts

Single-family homes in Los Angeles neighborhoods with predominantly Black, Hispanic, and low-income residents have fewer seismic retrofits than in other parts of the city.   By Rebecca Owen, Science Writer …

Figure 1. Figure 1. Spatial distribution of mainshocks with magnitude greater than or equal to 7.5 examined for dynamic triggering in Costa Rica. Each event is represented by its focal mechanism (also called a beachball diagram in reference to the average representation of the fault’s geometry). The events are also color coded by year of occurrence. Credit: Hajaji and Chaves, 2024, CC BY-NC-ND 4.0
Earthquake Insights / Expert Commentary / Publications / Temblor

Large, distant earthquakes can trigger microseismicity in Costa Rica

For the first time in Costa Rica, scientists document that earthquakes can communicate with faults, even at a distance of more than a thousand kilometers.   By Sonia Hajaji and …

Paul Tapponnier. Credit: Jmuffat, CC BY-SA 4.0, via Wikimedia Commons
Earthquake Insights / Essays / Publications / Temblor

Remembering Paul Tapponnier (1947-2024)

A memorial to Paul Tapponnier, a scientist at all scales.   By Yann Klinger, Institut de Physique du Globe, Université de Paris Cité     The first time I physically …

Earthquake Insights / Expert Commentary / Publications / Temblor

Stress releases at seismic gaps: Sunod-sunod na mga lindol tumama sa Silangang Mindanao

Mga lindol na kasalukuyang nagaganap sa silangang Mindanao, siniyasat ng mga siyentipiko mula sa DOST-PHIVOLCS   By Deo Carlo E. Llamas, Jeffrey S. Perez, Crystel Jade M. Legaspi, Jonard Jhon …

Figure 1. Seismotectonics of eastern Mindanao, at a depth of 10 kilometers, with recent seismic activity. This figure illustrates the Coulomb stress change resulting from the sequence of earthquakes off the coast of eastern Mindanao, utilizing optimally oriented strike-slip faults as receivers. Recent seismicity along the Philippine Fault is also shown. Data sources: Earthquake locations from PHIVOLCS and GFZ, focal mechanisms and location of active faults and trenches from PHIVOLCS, and SAR-derived topography from NAMRIA. Credit: Llamas et al., 2024, CC BY-NC-ND 4.0
Earthquake Insights / Expert Commentary / Publications / Temblor

Stress releases and seismic gaps: Earthquake sequences strike Eastern Mindanao, Philippines

DOST-PHIVOLCS scientists explore recent seismicity in eastern Mindanao, a southern Philippine island.   By Deo Carlo E. Llamas, Jeffrey S. Perez, Crystel Jade M. Legaspi, Jonard Jhon S. Acid, John …

Three tsunami wave height scenarios generated from simulations of underwater landslides. Landslide areas are outlined in purple. The smallest volume and shallowest landslide, CCS, produces the largest wave along the coast. Credit: Gallotti et al. 2022
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Italy investigates potential threat of tsunamis

Simulations of underwater earthquakes and landslides in the Ionian Sea found that they could generate tsunami waves as high as 2.5 meters in southern Italy.   By Laura Fattaruso, Simpson …

Figure 1. Map showing the past 30 days of earthquakes in the region, as well as Wednesday's mainshock. Credit: Temblor, CC BY-NC-ND 4.0
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Magnitude 4.1 earthquake rattles Corona, California

An earthquake was widely felt across the Los Angeles area. We provide a quick summary of what happened.   By Temblor Team Members (@temblor)   At 1:49 p.m. local time …

Recent photo of Tom Hanks. Credit: Molly Hanks, daughter of Tom
Earthquake Insights / Essays / Publications / Temblor

Remembering Tom Hanks (1944 – 2024)

A tribute to Thomas C. Hanks, a USGS geophysicist who showed himself to be a generous mentor, as well as a leading scientist.   By Wayne Thatcher, U.S. Geological Survey …

Lucille Jones (right) accepting the Beno Gutenberg Lecture award. Credit: American Geophysical Union
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Seismology for Society: A Q&A with Dr. Lucile Jones, the 2023 Beno Gutenberg Lecturer

For the AGU 2023 Gutenberg Lecture, Lucile Jones discussed how social science research has helped her to better communicate seismic research to the public and legislators.   By Fionna M. …

Topographic map showing location of New Jersey earthquake. Credit: Temblor, CC BY-NC-ND 4.0
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Magnitude 4.8 earthquake shakes the U.S. East Coast

On April 5, residents across a wide swath of New York, New Jersey, and Pennsylvania experienced what may have been their first — and possibly not last — earthquake.   …

Figure 3. Taiwan operates several earthquake early warning systems. All the earthquakes on the day of the mainshock that triggered a warning as part of the Palert system are shown as purple circles on this map. The smaller colored circles are the local shaking intensities across Taiwan that are associated with the April 2 mainshock. The density of these observations is perhaps only surpassed in Japan. The Palert system is accessible in real time from the Temblor-E-DREaM app (app.temblor.net). Credit: Stein et al., 2024, CC BY-NC-ND 4.0
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Magnitude 7.4 shock ruptures a fault in the Longitudinal Valley of eastern Taiwan

A magnitude 7.4 earthquake rocked much of Taiwan, causing death and damage. The eastern side of the island, near the epicenter, was especially affected.   By Ross S. Stein, Ph.D., …

Cities in Southern California that have accepted ordinances. Credit: U.S. Resiliency Council
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Single-family homes are falling through soft story ordinance gaps

Family homes with a room built atop the garage are common across the U.S. In an earthquake, these buildings risk collapse, but they are not currently covered by most local …

Construction of the NHERI TallWood building in March 2023, with a crane hoisting a mass timber panel that was installed as part of the rocking wall. (Credit: David Baillot, Jacobs School of Engineering, University of California San Diego)
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Test results are in: TallWood building a resounding success

After two phases of testing and more than 100 simulated earthquakes, the 10-story TallWood building perched atop the largest shake table in the world remained intact.   By Fionna M. …

The beauty of the downtown Los Angeles skyline belies seismic hazards. Credit: Adoramassey, CC BY-SA 4.0, via Wikimedia Commons
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Inequality persists after an earthquake’s impact

A new study highlights how predominantly minority neighborhoods in Los Angeles — and especially those with Black populations — will be most affected in the aftermath of a large earthquake. …

Tectonic map of the Türkiye region. The northward motion of the African and Arabian plates squeezes the Anatolian block toward the west, along the East Anatolian Fault. The gold star shows the location of the magnitude 7.8 mainshock on Feb. 6, 2023, and the blue star shows the location of the magnitude 7.5 event that struck later on the same day. Credit: U.S. Geological Survey (USGS)
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After the earthquakes: Experts discuss building codes in Türkiye and the U.S.

Experts reflect on building collapses in the wake of the 2023 Türkiye earthquakes and the importance of earthquake-resilient design in both the U.S. and Türkiye.   By Alice Turner, Ph.D., …

Figure 6. Stress transferred by the 2024 magnitude 7.5 earthquake to the surrounding faults indicates that several faults beyond the ends of the rupture were likely brought closer to failure (NT9, NT10, KZ1, KZ2, SD05, SD06). In contrast, most faults in Toyama Bay should be inhibited from failing as a result of the mainshock. Credit: Toda and Stein, 2024, CC BY-NC-ND 4.0
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Intense seismic swarm punctuated by a magnitude 7.5 Japan shock

A magnitude 7.5 earthquake on the western shores of Honshu, Japan, caused extreme shaking and felled a five-story building on New Year’s Day. The shaking was far more severe than …

An aerial view of the early lava flow east of Sundhnúka craters. Credit: Icelandic Civil Defense (Almannavarnadeild ríkislögreglustjóra)
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Volcano near evacuated Iceland town finally erupts

After a month of relative quiet, what caused the latest Iceland eruption near Grindavík? Read the latest developments here.   By Melissa Scruggs, Ph.D. (@VolcanoDoc)   Citation: Scruggs, Melissa A., …

Figure 1a. Seismotectonics ng magnitude 7.4 na lindol noong Disyembre 2, 2023, sa lalawigan ng Surigao Del Sur, Mindanao (katimugang Pilipinas). Resulta ng Coulomb stress change modelling gamit ang magnitude 7.4 mainshock bilang source fault (thrust mechanism) at ang sumunod na event (normal fault) bilang receiver fault. Ipinapakita rin ang focal mechanism solution ng mainshock (M7.4) at 24 na mga sumunod na seismic events na may magnitude mula 4.9 hanggang 6.8, at iba pang mga post-mainshock events na may mas mabababang magnitude (maliit na bilog). Ang lokasyon ng mga cross sections sa Figure 1b at 2, at ang Coulomb stress transfer cross section ng Figure 3 ay makikita rin sa mapa. Mga datos: Jarvis et al., 2008 para sa SRTM topography; Weatherall et al., 2020 para sa bathymetry; Toda et al., 2011 para sa CST modeling; PHIVOLCS para sa datos ng lindol. GMT (Wessel at Smith, 1995) ang ginamit upang likhain ang mapa. Tingnan ang teksto para sa higit pang talakayan. Credit: Aurelio, Catugas, Anicete, 2023
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Serye ng lindol sa Silangang Mindanao, tumama sa pumapailalim na extinct fracture zone

Sa may silangang baybayin ng Isla ng Mindanao sa katimugan ng Pilipinas, malalakas na lindol ang nagmumula bunsod ng labis na aktibidad ng Philippine Trench. Ngunit ang iba’t-ibang fault mechanisms …

Figure 1a Seismotectonics of the magnitude 7.4 earthquake of Dec. 2, 2023, in the province of Surigao Del Sur, Mindanao (southern Philippines). Result of Coulomb stress change modeling shown, using the magnitude 7.4 mainshock as source fault (thrust mechanism) and the next event (normal fault) as the receiver fault. Focal mechanism solutions of the mainshock (7.4) and 24 succeeding seismic events with magnitudes ranging from magnitude 4.9 to 6.8, and other post -mainshock events of lower magnitudes (small circles) are shown. Locations of cross section Figures 1b and 2 and Coulomb stress transfer cross section Figure 3 are shown. Data: Jarvis et al., 2008 for SRTM topography; Weatherall et al., 2020 for bathymetry; Toda et al., 2011 for CST modeling; PHIVOLCS for earthquake data. GMT (Wessel and Smith, 1995) was used to generate the map. See text for more discussion. Credit: Aurelio, Catugas, Anicete, 2023.
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Eastern Mindanao earthquake sequence strikes on subducting, extinct fracture zone

Off the eastern shore of Mindanao Island in the southern Philippines, large magnitude earthquakes result from the highly active Philippine Trench. But the varied fault mechanisms of the recent magnitude …

Earthquake Insights / Publications / Scientific Reports / Temblor

Pilipinas Niyanig ng Malakas Na lindol, at sinundan pa ng malalakas na mga aftershocks

Isang lindol na may lakas na 7.6 na megathrust ang nangyari malapit sa isla ng Mindanao. Matindi ang pagyanig, mayroong maliit na tsunami, at maraming napakalakas na aftershocks ang sumunod. …

Ang mainshock at ang dalawang pinakamalalaking aftershocks ay sumasaklaw sa isang kumpaktibong 100 by 100 square kilometer (60 by 60 square mile) na megathrust patch ng Philippine Trench. Ang sunud-sunod na pagyanig ay tinutukoy ng mga numero 1-3, na ipinapakita sa kulay pula. Ang mga pangyayaring ito ay naganap sa loob ng 30 oras. Maraming mas maliit na aftershocks din ang nangyari, kabilang ang magnitude 6.6 at magnitude 6.4.
Earthquake Insights / Publications / Scientific Reports / Temblor

Major earthquake strikes the Philippines, followed by unusually large aftershocks

A magnitude 7.6 megathrust earthquake occurred near Mindanao Island. Strong shaking, a small tsunami and many very large aftershocks have followed.   By Ross S. Stein, Ph.D., Temblor, Inc. and …

Mapa ng mga nagdaang lindol na may tsunami sa isla ng Mindanao sa Pilipinas. Ipinapakita rin ang focal mechanisms para sa 2023 magnitude 6.8 offshore Davao Occidental Earthquake at sa 2023 magnitude 7.4 offshore Surigao del Sur Earthquake are shown. Credit: DOST-PHIVOLCS
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Dalawang lindol sa karagatan ng Pilipinas: Ano ang dapat malaman ng mga pamayanang nasa baybayin?

Sa nakaraang ilang lingo, dalawang lindol na may Magnitude 6.8 at 7.4 ang tumama sa Mindanao. Ang malakas na pagyanig ay nagdulot ng pagkasira sa mga istruktura, liquefaction, landslides, pagbabago …

Past tsunamigenic earthquakes around Mindanao Island, Philippines. The focal mechanisms for the 2023 magnitude-6.8 offshore Davao Occidental Earthquake and the 2023 magnitude-7.4 offshore Surigao del Sur Earthquake are shown. Credit: DOST-PHIVOLCS
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Two offshore earthquakes in the Philippines: What do coastal communities need to know?

Magnitude 6.8 and 7.4 earthquakes struck Mindanao Island in the last couple of weeks. The strong ground shaking caused significant structural damage, liquefaction, landslides, sea-level disturbance and tsunamis. Experts examine …

“Did You Feel It?” map of community-reported shaking intensity reported to the USGS for the magnitude-7.8 Pazarcik earthquake, which began the Kahramanmaraş earthquake sequence. Credit: USGS
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International seismic standardization is underway

Creating an international standard for seismic intensity reports will lead to more accurate earthquake characterization.   By Montana Denton, Temblor science writing extern (@montana_denton)   Citation: Denton, M., 2023, International …

Rift zones and volcanic zones of Iceland. The Reykjanes Peninsula — the site of regular volcanic activity since 2021 — is outlined with a black rectangle. The vil-lage of Grindavík lies on the southern coast of the Peninsula and has currently been evacuated due to a potential volcanic eruption. Credit: derivative work, original by Chris.urs-o, CC BY-SA 3.0, via Wikimedia Commons. Additional annotation by Melissa Scruggs
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Iceland’s ground swells as volcanic eruption looms near Grindavík

How close is Iceland’s Grindavík to a volcanic eruption? Read the latest developments here.   By Melissa Scruggs, Ph.D., Science Writer (@VolcanoDoc)   Citation: Scruggs, Melissa A., 2023, Iceland’s ground …

This map of Northern Afghanistan shows the location of the Herat earthquake sequence, as well as its proximity to the Hari-Rud fault system. The background colors show the shaking likely in your lifetime, which comes from transforming the Global Earthquake Activity Rate (GEAR) model into a shaking model called Probabilistic Uniform Seismic Hazard (PUSH). PUSH is globally consistent and corrected for soil amplification, and was trained on the USGS shaking model. Credit: Temblor, CC BY-NC-ND 4.0
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Four magnitude-6.3 earthquakes strike in succession near Herat, Afghanistan

The recent quadruplet of earthquakes that have rocked Herat, Afghanistan, bring an important question to the fore: how can traditional earthen buildings be strengthened to withstand shaking?   By Alice …

A surface rupture near where the maximum surface displacement occurred from the magnitude-7.1 earthquake that struck the Ridgecrest, California, area in 2019. Credit: USGS/Ben Brooks
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New model tackles immature faults and their widespread fractures

Immature faults, such as those in the Eastern California Shear Zone, generate widespread fracturing at the surface during earthquakes. A new displacement model characterizes the hazard posed to infrastructure by …

Two homes after the magnitude-6.0 earthquake in Napa, Calif., in 2014. The one that is not retrofitted was too structurally damaged to be immediately habitable (left) while the retrofitted home next door was structurally sound (right). Credit: California Earthquake Authority
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Thinking of retrofitting your home? Here’s what you should know

If you’re considering a seismic retrofit, Janiele Maffei, the executive director of the California Residential Mitigation Program, has some advice.   By Fionna M. D. Samuels, Ph.D., Optimum Seismic Fellow …

Surface rupture caused by the magnitude-7.1 Ridgecrest earthquake. Credit: Ben Brooks, USGS
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Old dike swarms could influence future fault ruptures

Identifying active fault zones can help scientists determine whether an area is prone to surface rupture; finding features associated with ancient volcanoes may help.   By Thystere Matondo Bantidi, Ph.D., …

This GOES-18 GeoColor image shows Tropical Storm Hilary making landfall on August 20, 2023. Credit: Cooperative Institute for Research in the Atmosphere at Colorado State and the National Oceanic and Atmospheric Administration (CSU/CIRA & NOAA)
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Southern California earthquake was unlikely triggered by Hurricane Hilary

Meteorological data suggest that simultaneous heavy rainfall from Hurricane Hilary and an earthquake in Ojai, California, were coincidences.   By Qiushi Zhai (Caltech Seismological Laboratory, qzhai@caltech.edu), Zhigang Peng (School of …

Figura 3. En esta imagen, similar a un ShakeMap del USGS, se calculó la PGA para la región utilizando un terremoto de magnitud 6,8 a 26 kilómetros de profundidad en el epicentro del USGS (estrella blanca). El movimiento está representado por la aceleración máxima del suelo (PGA) en unidades de g, la aceleración de la gravedad. Temblor Shaking Footprint utiliza el modelo de movimiento del suelo (T-GMM) y el modelo de amplificación del sitio (SiteAmp) de Temblor. El movimiento del suelo disminuye con la distancia al epicentro, pero se amplifican en las cuencas. Una amplia cuenca se encuentra al norte y contiene la ciudad de Marrakech. Otra cuenca estrecha se encuentra al sur. Crédito: Temblor, CC BY-NC-ND 4.0
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El mortal terremoto de Marruecos fue el resultado de la continua colisión de África con Europa

El devastador terremoto que sacudió Marruecos el 8 de septiembre de 2023 cobro la vida de miles de personas. Si bien no fue un evento sin precedentes, tuvo lugar en …

Figure 3. Sur cette image, l'empreinte des secousses du Temblor, qui est similaire à une carte des secousses de l'USGS, a été calculée pour la région à partir d'un tremblement de terre de magnitude 6,8 à 26 kilomètres de profondeur à l'épicentre de l'USGS (étoile blanche). Les secousses sont représentées par l'accélération maximale du sol (PGA) en unités de g, l'accélération gravitationnelle. L'empreinte des secousses de Temblor utilise le modèle de mouvement du sol de Temblor (T-GMM) et le modèle d'amplification du site (SiteAmp). Les secousses diminuent avec la distance de l'épicentre, mais sont amplifiées dans les bassins. Un large bassin se trouve au nord et contient la ville de Marrakech. Un autre bassin étroit se trouve au sud. Crédit : Temblor, CC BY-NC-ND 4.0
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Le tremblement de terre meurtrier au Maroc résulte de la collision actuelle entre l’Afrique et l’Europe

Le tremblement de terre dévastateur qui a frappé le Maroc le 8 septembre 2023 a tué des milliers de personnes. Il n’était pas sans précédent, bien qu’il se soit produit …

Figure 3. In this image, the Temblor Shaking Footprint, which is similar to a USGS ShakeMap, has been calculated for the region using a magnitude-6.8 source earthquake at 26 kilometers depth at the USGS epicenter (white star). Shaking is represented by the peak ground acceleration (PGA) in units of g, gravitational acceleration. The Temblor Shaking Footprint uses Temblor's ground motion model (T-GMM) and site amplification model (SiteAmp). A broad basin lies to the north and contains the city of Marrakech. Another narrow basin lies to the south. Shaking diminishes with distance from the epicenter, but is amplified in these basins. Credit: Temblor, CC BY-NC-ND 4.0
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Deadly Morocco quake resulted from Africa’s ongoing collision with Europe

The devastating earthquake that struck Morocco on September 8, 2023 killed thousands of people. It was not unprecedented, although it did occur in a less seismically active zone than other …

Some of the University at Buffalo team standing next to the finished test structure before the first test. Credit: Douglas Levere
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Largest US-based shake-table test of masonry buildings completes first phase

Researchers at the University at Buffalo put a retrofitted brick-and-mortar building to the test. Though the building stood up to the “earthquakes” it’s designed for, stronger shaking caused bricks to …

Map showing the location of the mainshock and numerous aftershocks as of Sunday afternoon. Several segments of the San Cayetano fault system are labeled. Credit: Temblor, CC BY-NC-ND 4.0
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Southern California shaken by earthquake during unrelated hurricane

On Sunday, a magnitude-5.1 earthquake struck about 7 kilometers (4.3 miles) southeast of Ojai, Calif., likely due to a small, as-yet unidentified fault near the San Cayetano Fault. The confluence …

Hurricane Hilary was a category 4 hurricane at its strongest, as shown in this satellite image from GOES-18. Credit: Cooperative Institute for Research in the Atmosphere at Colorado State and the National Oceanic and Atmospheric Administration
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How many Hurricane Hilarys would it take to trigger an earthquake? Probably a lot

As Hurricane Hilary lashes the southwestern U.S., some may wonder if an earthquake could result. Not likely, scientists say.   By Alice R. Turner, Ph.D., Simpson Strong-Tie Fellow (@SeismoAlice)   …

This map shows the locations of the mainshock and two large aftershocks that struck Colombia on the afternoon of Thursday, August 17, 2023. The earthquake magnitudes and locations come from the U.S. Geological Survey catalog, instead of the local network. Credit: Temblor, CC BY-NC-ND 4.0
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Serie de sismos sacude el centro de Colombia

Ayer, una serie de sismos, comenzando con un evento de magnitud 6,1, sacudió Bogotá, la capital de Colombia, y otras ciudades a lo largo de la Cordillera Oriental.   By …

This map shows the locations of the mainshock and two large aftershocks that struck Colombia on the afternoon of Thursday, August 17, 2023. The earthquake magnitudes and locations come from the U.S. Geological Survey catalog, instead of the local network. Credit: Temblor, CC BY-NC-ND 4.0
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Earthquake Sequence Rattles Central Colombia

Yesterday, a series of earthquakes, starting with a magnitude-6.1 event, shook Colombia’s capital city of Bogotá and other cities along the Eastern Cordillera.   By Albert Leonardo Aguilar Suarez, Ph.D. …

Reflected and direct signals reaching a GPS antenna. Credit: Lucia Bellino & Zach Courter via EarthScope
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Do earthquakes produce signals before they rupture? Maybe, scientists say

A new study suggests a warning sign may be available two hours before an earthquake strikes. An independent analysis suggests otherwise, and underscores the importance of rapid, open exchange of …

The U.N. Development Program estimates the February 2023 Türkiye quakes generated some 100 million cubic meters of debris and waste — about 10 times that produced by the 2010 Haiti quake. Piled up, that would equate to 38 piles of waste, each of which would be the size of the Great Pyramid in Egypt, Reuters reported in May. Credit: Adem, (CC BY-SA 4.0)
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Cleanup on the disaster aisle

Natural hazards that become disasters produce literal tons of debris that need to be quickly cleaned up. However, very few countries consider disaster waste cleanup to be a critical service …

Portland, Oregon, faces seismic risk from both the Cascadia Subduction Zone off the coast and local faults. Credit: Amateria1121, CC BY-SA 3.0, via Wikimedia Commons
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Portland’s seismic hazards stem from subduction zone, local faults

Oregon is susceptible to shaking from both shallow crustal earthquakes and large-magnitude subduction zone shocks. In either scenario, the population of Portland would be at risk.   By Alice R. …

Each panel shows the different tests of peak ground velocity from Parameswaran et al., (2023). Panel (a) includes only the three GNSS stations that were either closely located or collocated with strong-motion sensors. Panel (b) includes their strong-motion counterparts in the three chosen station pairs. Panel (c) includes all operational GNSS stations less than about 700 kilometers from the epicenter. In panel (d), the GNSS stations from (a) have been swapped with the corresponding strong-motion sensor data in (b). Triangles denote the GNSS stations and squares are the co-located strong-motion sensors. Contour lines show peak ground velocity derived from the different methods. Credit: Parameswaran et al. (2023).
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Quick quake calcs: GNSS data speed up assessment

Global satellite navigation systems (GNSS) can be used to help quickly characterize damaging earthquakes when seismic sensors aren’t available, according to new research. GNSS data especially help in areas where …

Helicopter response after the magnitude-5.9 earthquake in Afghanistan, June 2022. Because there was no dense seismic network to estimate the level of ground shaking experienced in underdeveloped mountain regions that are also vulnerable to landslides, the extent of the damage was not clear for several hours. For this event, LastQuake collected 50 reports in 8 minutes, which was required to run researchers' model to estimate initial damage. Credit: Tasnim News Agency via Wikimedia Commons (CC BY 4.0)
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Earthquake emergency response: How can felt reports help?

A new method utilizes online testimonies collected after earthquakes to classify events as high or low impact in the immediate aftermath. The approach may provide emergency responders with valuable information, …

Map highlighting the key counties in California where the seismic risk is among the highest in the entire country. Credit: USGS
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Earthquake damages likely to cost U.S. billions more per year than expected

A new report released in April estimates annual earthquake losses in the U.S. of $14.7 billion — a 140 percent increase over the previous estimate of $6.1 billion per year. …

“Temporary” housing for survivors of the 2011 Tōhoku earthquake and subsequent tsunami in Onagawa town (some are still in such housing more than decade after the disasters). Credit: Forgemind ArchiMedia , CC BY 2.0
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Machine learning approach for disaster-related trauma and subsequent functional limitations

Along with social and economic losses, large-scale natural disasters often have adverse effects on the mental, cognitive and functional health of those who survive them. A new study looks at …

The East Anatolian Fault hosted the first of two major earthquakes that struck Turkey in Feb. 2023. The Sürgü-Çardak fault ruptured about 9 hours later. Credit: Temblor, CC BY-NC-ND 4.0
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Next steps in seismic hazard reduction after the Turkey earthquakes

A new study offers insights, warnings and recommendations for moving forward from the recent devastation that followed the Feb. 2023 Turkey earthquakes.   By Rebecca Owen, Science Writer (@beccapox)   …

Rocking walls being installed on the TallWood test building prior during construction last year. Credit: David Baillot, Jacobs School of Engineering, University of California San Diego, CC BY 2.0
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TallWood Project tests earthquake-resistant structure

Researchers are redefining structural resilience this month by testing the first 10-story TallWood building made of mass timber and rocking walls on the University of California San Diego’s shake table. …

More than 160,000 buildings collapsed or were destroyed in the February 2023 earthquakes in Türkiye. Credit: Adem , CC BY-SA 4.0
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Opinion: Do we need a United Nations Framework Convention on Earthquake Hazards?

Like climate change, earthquake hazards disproportionately impact poor and developing nations, which makes it imperative for a global organization such as the United Nations to create a parallel treaty for …

The beauty of North Sulawesi belies its geologic hazards. Credit: MaRo-Visions, CC BY-SA 4.0
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Disaster training begins in tourist hot spot Likupang, Indonesia

Indonesian scientists fulfill the need for earthquake education on islands replete with tectonic-related hazards, starting with North Sulawesi.   By Anne Sirait, Geophysics Program, Universitas Indonesia and Seismology Division of …

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Magnitude-4.4 earthquake rattles the Bay Area and Salinas Valley

Hollister and Bay Area residents saw their afternoon interrupted by a magnitude-4.4 temblor on April 4. The event, which occurred after 3 p.m. with an epicenter near Tres Pinos, was …

On March 31, a magnitude-4.2 struck near the Palomar Observatory in Southern California. Credit: Signal Mirror, CC BY 2.0
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Palomar Observatory earthquake rocks Southern California

A magnitude-4.2 earthquake shook Southern California last Friday. The event, with an epicenter 3 miles from Caltech’s Palomar Observatory, was felt widely throughout San Diego and the Los Angeles area. …

Eric Garcetti, former mayor of Los Angeles, speaks at the Valley Economic Alliance Luncheon at California State University, Northridge on the 20th anniversary of the Northridge earthquake. Credit: courtesy of Eric Garcetti, CC BY-NC-ND 2.0
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Los Angeles mayor, now ambassador, talks earthquake resilience

Former Los Angeles Mayor Eric Garcetti, who was just confirmed as the next ambassador to India, talks with Temblor about resilience, the importance of neighborhoods and his love of earthquakes. …

The largest payouts in the 16-year history of the CCRIF are for storm damage, like Tropical Cyclone Dorian, which caused about $3.4 billion damage in the Bahamas in 2019. CCRIF paid out about $12,800,000 to the Bahamas shortly after that storm struck the island nation. Credit: Seaman Erik Villa Rodriguez/ U.S. Coast Guard
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Desarrollo de nuevos modelos paramétricos de seguros por terremoto para el Caribe y Centroamérica

Las pólizas de seguro paramétricas realizan los pagos basados en unas reglas preestablecidas, como por ejemplo la magnitud y/o ubicación de un terremoto. Algunos países pueden beneficiarse de los desembolsos …

The largest payouts in the 16-year history of the CCRIF are for storm damage, like Tropical Cyclone Dorian, which caused about $3.4 billion damage in the Bahamas in 2019. CCRIF paid out about $12,800,000 to the Bahamas shortly after that storm struck the island nation. Credit: Seaman Erik Villa Rodriguez/ U.S. Coast Guard
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Developing new parametric insurance models for Caribbean and Central American countries

Parametric insurance policies pay based on pre-agreed thresholds like the magnitude and/or location of an earthquake. Some countries benefit from rapid payouts using this type of insurance.   By Mario …

If you're visiting New Zealand, learn about what hazards you might face. Auckland, for example, is built on a vol-canic field. Credit: Craig, via Wikimedia Commons, CC BY 2.0
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Earthquakes, volcanoes, tsunamis and landslides: How Aotearoa New Zealand manages a medley of hazards

Temblor chats with Gill Jolly, research leader for the Natural Hazards and Risks arm of GNS Science Te Pū Ao, the government agency that conducts geological and geophysical monitoring of …

Damaged building in Mayaguez, Puerto Rico. Credit: Jose Luis Rodriguez, Rodriguez Archives LLC, Connecticut, via NOAA/NCEI
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Submarine sleuthing exposes cause of 1918 Puerto Rico tsunami

Researchers found that an ancient, mineral-encrusted landslide was too old to have caused the 1918 tsunami. A nearby fault was to blame instead.   By Lauren Milideo, Science Writer (@lwritesscience) …

Pallett Creek, originally excavated in the 1970s, was one of the first to be studied to reveal the timing and magnitude of historical earthquakes along the San Andreas Fault. Credit: Michael R. Perry, Via Flickr, CC BY 2.0.
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Remembering past earthquakes improves earthquake forecasts

Scientists developed a new and more accurate model to forecast earthquakes by mimicking the energy release of past earthquakes.   By Jeng Hann Chong, PhD Candidate at the University of …

Figure 5. The roughly 600-kilometer-long East Anatolian Fault from Emre et al. (2018) is highlighted by a 20-kilometer-wide translucent yellow band. The inset surface rupture map from Rietman et al. (2023) is at the same scale as the active fault map. Surprisingly, neither the magnitude-7.8 nor the magnitude-7.5 shock nucleated on the East Anatolian Fault.
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Interactions, stress changes, mysteries, and partial forecasts of the 2023 Kahramanmaraş, Türkiye, earthquakes

Brought closer to failure by the Feb. 6, 2023, magnitude-7.8 shock, the magnitude-7.5 shock that struck nine hours later caused aftershocks to turn on in some zones and off in …

Skyline of downtown Seattle. Credit: James Conkis, via Wikimedia Commons, CC BY-SA 4.0
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Piecing together the puzzle of the Seattle Fault Zone

New findings on Bainbridge Island offer insights into the history and behavior of a complex fault system under Seattle, Washington.   By Rebecca Owen, Science Writer (@beccapox)   Citation: Owen, …

Figure 3. The source regions of the two major earthquakes are depicted by the aftershocks located by Kandilli Observatory and Earthquake Research Institute (KOERI). The color of the symbols indicates the time elapsed since the origin time of the first event (Feb. 6, 2023, 01:17 GMT) The stars indicate the rupture initiation locations. The solid lines identify the active faults reported by Emre et al. (2012). Credit: Erdik, Tümsa, Pınar, Altunel, and Zülfikar
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A preliminary report on the February 6, 2023 earthquakes in Türkiye

At 4:17 a.m. on Feb. 6, 2023, a magnitude-7.8 earthquake struck near Pazarcık City in south-central Türkiye, followed by a magnitude-7.5 event about 9 hours later. In this report, scientists …

Fig 2. Mapa mostrando la distribución espacial de los 3 eventos de mayor magnitud generados en el segmento Este de la Falla Anatolia. El sismo de M 7.8 del 6 de febrero rompió el Gap Suroeste del EAFZ y activó el sistema de falla Sürgü con terremoto de magnitud 7.5. Imagen adaptada de Temblor.net.
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Los terremotos devastadores en Turquía y la frontera noroeste de Siria

El segmento Este de la Falla Anatolia en Turquía fue un gigante que despertó el 6 de febrero de 2023, generando un terremoto de Magnitud 7.8, con consecuencias devastadoras. Este …

Burada 7.8 ve 7.5 büyüklüğündeki iki depremin yanı sıra, 2020 Elazığ 6.8 depreminin gerilme yüklemesinin bileşkesini Doğu Anadolu Fay Zonu'nun genel karakterine uygun idealleştirilmiş faylara uyguluyoruz.
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Gerilme değişimi hesaplamaları, 2023 Türkiye depremlerinde artçı şoklar için ipuçları veriyor

Sürgü ve Çardak faylarındaki 7.5 büyüklüğündeki depremin, 110 kilometre güneyde meydana gelen Doğu Anadolu Fayındaki 7.8 büyüklüğündeki deprem ile tetiklenmiş olabileceğini erken verilere ve modellere dayalı Coulomb gerilim hesaplamaları göstermektedir. …

Here we combine the stress imparted by the 2023 magnitude-7.8 and magnitude-7.5 quakes as well as the 2020 magnitude-6.8 event, to an idealized East Anatolian Fault Zone trend.
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Stress change calculations provide clues to aftershocks in 2023 Türkiye earthquakes

Coulomb stress calculations based on preliminary data and models suggest that the magnitude-7.5 shock on the Sürgü and Çardak faults was brought closer to failure by the magnitude-7.8 rupture on …

The magnitude-7.8 quake struck on the East Anatolian Fault. Historically, this region, including this fault, has been extremely seismically active. The arrows give the sense of motion of the fault. The color ramp gives the magnitude (within 100 kilometers) that’s likely in a lifetime. The cities of Adiyman and Malaya, where strong shaking was first reported, are underlined in lime green.
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Turkey and Syria devastated by earthquake

A powerful magnitude-7.8 earthquake struck southern Turkey, near the Syrian border, followed by a magnitude-7.5 quake nine hours later. Thousands of casualties have been reported, with more expected.   By …

The magnitude-6.4 quake struck within the Mendocino Triple Junction, where three tectonic plates meet. Because the junction is distorted and compressed, deformation is distributed across a network of faults, one of which ruptured on Dec. 20, 2022. Historically, the junction has been extremely seismically active, but fortunately it is more lightly populated and better prepared than most areas in the United States. The arrows give the sense of motion of the faults. The color ramp gives the magnitude (within 100 kilometers) that’s likely in a lifetime. Note that likely maximum magnitude within 100 kilometers of the Mendocino region in a lifetime is magnitude 7.2.
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December 2022 California earthquake ruptured unknown fault: An analysis

The quake produced severe shaking in a lightly populated area, brought the southern tip of the Cascadia Subduction Zone slightly closer to failure, and modestly inhibited rupture on the San …

Skyline of Salt Lake City, Utah. Credit: Garett, via Flickr, CC BY 2.0
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Wasatch corridor in Utah prone to big quakes and shakes

Utah has experienced energetic earthquakes in the past. If a magnitude-7.0 earthquake hits the state, major cities would feel strong shaking and likely experience events triggered by the shock. By …

Surface rupture from the July 2017 magnitude-6.4 Ridgecrest Earthquake. Credit: Ben Brooks and Todd Ericksen, United States Geological Survey
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Harnessing citizen science helps develop efficient earthquake early warning

A group of social scientists, seismologists and engineers is developing surveys to understand the efficacy of earthquake early warning alerts.   By Meghomita Das, Palomar Fellow (@meghomita)   Citation: Das, …

Figure 3. Examples of structural damage in Düzce and Gölyaka. Credit: Adapted from Özalp and Kürçer, (2022)
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What happened in Düzce? A preliminary assessment of the November 23 quake in Western Turkey

A magnitude-6.1 earthquake that shook western Turkey in November struck a region that also shook in August and November 1999. Reports of shaking revealed significant variation in intensity. Why?   …

In Temblor's hazard model, an earthquake of this size is expected in one's lifetime if they live in the Eureka area.
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Earthquake rumbles Northern California triple junction

A magnitude-6.4 earthquake struck off the seismically active coast of Northern California, not far from Eureka, on Tuesday, Dec. 20.   By Temblor Editorial Team, (@temblor)   This is story …

Caption: View from Oakland Hills, not far from Berkeley, across the San Francisco Bay. Credit: --Mark--, CC BY-NC-SA 2.0
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From ShakeAlert to smartphones: Earthquake Early Warning now and beyond

Getting notifications to people in the event of an earthquake is a key component of earthquake early warning systems. Apps like MyShake and companies like Google are leading the way. …

The Indonesian island of Sulawesi endured widespread damage from a magnitude-7.5 supershear earthquake in 2018. Credit: Ungkeito, CC BY-SA 4.0 via Wikimedia Commons
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Speed kills: fast, potentially damaging earthquakes more common

A global survey of large strike-slip earthquakes (greater than magnitude 6.7) reveals that over a 20-year period, 14 percent of such earthquakes sustained supershear rupture speeds.   By Laura Fattaruso, …

Figure 1 Seismotectonics of the two earthquakes affecting the province of Abra in northern Philippines in less than three months this year, namely a magnitude 7.0 July 27 and a magnitude 6.4 October 25. Result of Coulomb stress change modeling shown, using the July earthquake as source and the northeast striking, southeast dipping nodal plane of the focal mechanism solutions of the October earthquake as the receiver. Aftershocks of the two seismic events are shown as light purple circles with purple outline for the July earthquake, and light green circles with green outline for the October earthquake. Gray circles with white outline are background historical earthquake epicenters. Inset map on the lower right corner indicates place names of towns and provinces discussed in the text. Locations of CST cross sections A-A’, B-B’ and C-C’ shown in Figure 2 indicated as light green lines. References: Jarvis et al., 2008 for SRTM topography; Weatherall et al., 2020 for bathymetry; Toda et al., 2011 for CST modeling; PHIVOLCS for earthquake data. GMT (Wessel and Smith, 1995) was used to generate the map. See text for more discussion. Credit: Aurelio, Catugas, Ramirez, Aurelio, Lagmay.
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Two large quakes hit Abra, Philippines, in three months. What does this mean?

An October magnitude-6.4 quake succeeded a July magnitude-7.0 earthquake that struck the same region. What do these quakes tell us about the faults involved and whether the second was an …

The Nankai Trough poses a hazard to many of Japan’s southern islands.
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Miles below the seafloor, scientists gather data on subduction stress

Scientists drilled deep below the seafloor to see how stress builds within the Nankai megathrust, a major subduction zone off Japan’s southeast coast.   By Jay Barber, Science Writer (@JayBarber77) …

Lava flows are moving northeast down the slopes of Mauna Loa volcano for the first time in 38 years. View from Saddle Road at 6:00 a.m. on Nov. 29, 2022. Credit: USGS.
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Earth’s largest volcano has started erupting. What might we expect?

After months of heightened earthquake activity, Earth’s largest volcano has erupted for the first time in 38 years. Previous eruptions of Mauna Loa can give scientists some clues as to …

More than 22,000 houses were destroyed or damaged in the magnitude-5.6 earthquake on West Java. Credit: ABSEE HOUSE / Shutterstock.com
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Gempa Kerak Dangkal Mengguncang Jawa Barat

Minggu ini, gempa dengan magnitudo mengguncang Jawa Barat, Indonesia, mengakibatkan getaran dan kehilangan.   Oleh Anne Sirait, Ph.D., Program Studi S1 Geofisika, Universitas Indonesia dan anggota Divisi Seismologi Himpunan Ahli …

The earthquakes in the catalog struck over much of southern Mexico.
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No, septiembre no es el “mes de los sismos” en México

Aunque septiembre ha tenido algunos sismos importantes en los últimos años, no hay nada especial en este mes.   Por Manuel J. Aguilar-Velázquez (@ManuAguilar411), R. Daniel Corona-Fernández (@rdcoronaf), y Miguel …

The earthquakes in the catalog struck over much of southern Mexico.
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Is September really “earthquake month” in Mexico?

Though September has seen a few big earthquakes in recent years, there is nothing special about the month.   By Manuel J. Aguilar-Velázquez (@ManuAguilar411), R. Daniel Corona-Fernández (@rdcoronaf), and Miguel …

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