by Jennifer Schmidt, Ph.D. (@DrJenGEO) Researchers used seismic signals from 8,000 earthquakes after the Gorkha quake in 2015 to image the fault structure beneath Nepal. They found a system of …
As of today, some 24 people are dead and 650 injured, and many more are unaccounted for in collapsed concrete buildings on the coastal plains surrounding the epicenter. The quake likely struck on a ‘blind thrust fault’ that does not reach the Earth’s surface but had nevertheless been previously identified by geologists.
Realtime aftershock statistics may be able to identify whether an even larger event is likely to follow, the authors of a new study argue. Additional prospective testing and more strategic public communication will be needed prior to deployment
Warnings were issued for the magnitude-4.5 and magnitude-4.7 quakes 5-6 seconds after they ruptured via ShakeAlert, and alerts reached beta testers of the MyShake app about 2 seconds later. While important progress, these intrinsic delays mean that those who experienced strong shaking received no warning. Alert delays may be longer as the number of alert recipients grows.
The recent acquittal of the TEPCO executives in the Fukushima power plant tragedy hearkens back to the trial of the Italian seismologists who were charged with negligence after the L’Aquila, Italy, earthquakes. Both events raise the question: How much do you prepare for the most dreadful disasters, which result from truly large or rare paroxysms of the Earth?
A 2018 study published in Nature by Phoebe DeVries and her colleagues at Harvard and Google claimed that Deep Learning was able to predict the locations of aftershocks with accuracies far greater than Coulomb stress transfer could achieve
Tiegan Hobbs, Ph.D., Postdoctoral Seismic Risk Scientist, Temblor @THobbsGeo Across the planet, people dropped under their tables at 10:17am on 10/17 to practice what to do in the event of …
17 Oct 2019 marks the 30th anniversary of the Loma Prieta earthquake, the Bay Area “wake-up call” that revealed our weaknesses and catalyzed our preparation. But the quake has been …
Another earthquake with magnitude greater than 4 has struck California in less than a day. It occurred on a portion of the San Andreas Fault which is relatively quiet, but …
Last night, nearly everyone in the greater Bay area was awakened at 10:30 pm by a Magnitude 4.5 shock near the town of Pleasant Hill, north of Walnut Creek
A new comprehensive study of almost 100,000 earthquakes in Japan suggest that large or small, quakes look alike in the first 0.2 seconds
One hospital, four schools, and nine administrative buildings are severely damaged. Some 29 schools of various degrees of damage were forced to close, at least temporarily.
Based on the M 5.7 aftershocks thus far, there is a 3% chance that it could trigger a magnitude-6.5 or larger shock in the next year. The M 5.7 also brought a portion of the Marmara Fault significantly closer to failure.
A fault lying just a few kilometers below Los Angeles is active, according to new research. The work suggests previous examinations of so-called blind-thrust faults might need to be revisited …
Just two days shy of the one-year anniversary of the deadly earthquake and tsunami in Palu, Indonesia, a major earthquake ruptured beneath the nearby island of Maluku on the morning of Thursday, September 26. Local agencies are reporting 20 dead and 2,000 displaced in the wake of this M 6.5 earthquake.
The Magnitude 7.1 earthquake abruptly halted aftershocks on the M 6.4 cross fault. It also produced a far-flung aftershock sequence that touched the San Andreas, but refused to cross the Garlock Fault.
Her yıl depremlerden dolayı ortalama 1.000 kişinin hayatını kaybettiği, 2.000 kişinin yaralandığı, 7.000’den fazla binanın kullanılamaz duruma geldiği ülkemizde deprem hiçbir zaman sürpriz olmayacaktır.
Tiegan Hobbs, Ph.D., Postdoctoral Seismic Risk Scientist, Temblor (@THobbsGeo) Sandwiched in the neighborhood of the 1960 M=9.5, 2010 M=8.8, 2015 M=8.3 and 1985 M=7.8 earthquakes, a M=6.8 earthquake went virtually unreported …
Apollo 11 was the first step for humankind, and a giant leap for seismology. Landing and deploying seismic sensors on the moon required significant advances in instrumentation and shaped the study of earthquakes. Now we know that both planets host tidally triggered earthquakes.
Engineers may have found a way to measure displacement between floors of multistory buildings cheaply, accurately and in real-time, paving the way for quick analysis of the stability of critical infrastructure (e.g. hospitals, airports, water treatment plants) in the event of an earthquake.
A new image of the ground deformation, a rich and enigmatic foreshock sequence, aftershock trends we can explain, and others that are more elusive. This is also the time see how Temblor app’s hazard forecast for Ridgecrest fared.
The 50-km-long rupture has triggered widely dispersed aftershocks. However, almost none of these struck on the faults that the M 7.1 brought closer to failure: The major Garlock Fault; or the Blackwater, Panamint Valley, or Sierra Nevada Faults.
Ross S. Stein, Ph.D., Tiegan Hobbs, Ph.D., Chris Rollins, Ph.D., Geoffrey Ely, Ph.D., Volkan Sevilgen, M.Sc., and Shinji Toda, Ph.D. The M 6.4 earthquake loaded the site where the …
While it wasn’t the ‘Big One’, activity near the Revere-Dellwood Fault at the northern end of the Cascadia Subduction Zone is a reminder to Canadians to be prepared for shaking.
Tiegan Hobbs, Ph.D., Postdoctoral Seismic Risk Scientist, Temblor (@THobbsGeo) Chris Rollins, Ph.D., Postdoctoral Researcher, Michigan State University Citation: Hobbs, T.E. and Rollins, C., (2019), Earthquake early warning system challenged …
The site of the 4th of July shock was stressed by the great 1872 Owens Valley quake and the 1992 Landers quake. Their overlapping stress lobes may have raised the stakes for this region.
Il 23 giugno, un terremoto di magnitudo 3.6 ha avuto come epicentro la città di Colonna, a sud-est di Roma, tra il complesso vulcanico dei Colli Albani e la città di Tivoli, famosa per l’estrazione del travertino. Non si è quindi trattato di uno scuotimento dovuto a un forte terremoto nell’Appenino centrale, come inizialmente temuto.
On June 23, a Mw=3.6 earthquake struck Colonna, Italy, southeast of Rome. Despite initial fears that it was yet another large quake near the central Apennines, it struck instead nearby the Alban Hills volcanic complex and the source of the famed Tivoli marble.
While Japan is moving entire towns out of the tsunami zone in the wake of the 2011 Tohoku disaster, Oregon is doing the opposite, trading public safety for developer profits.
Mars InSight Lander: Marsquakes, Breakthroughs, and Breakdowns
Could the 2019 M=6.4 Yamagata-Oki, Japan, earthquake be an aftershock of an M=7.5 event that struck in 1964
Previous research suggests that not until halfway through the rupture—90 seconds for an M=9 shock—can one predict its magnitude, but new findings could bring this down to 10-15 sec, which would greatly extend and enhance Earthquake Early Warnings.
While no one quake can invalidate an earthquake hazard model, larger-than-expected quakes on both the Tohoku and Japan Sea coasts point to inadequacies in Japan’s national seismic model.
Nel 1908 un terremoto di magnitudo 7.1 colpì la città di Messina. Il terremoto e successivo tsunami devastarono l’abitato, uccidendo più di 75.000 persone.
This study has shown that it is better to try and link historical earthquakes to studied and mapped active faults, and therefore to use this information when calculating the seismic hazard posed to a region.
The mysterious ‘Fontana Trend’ lit up in shallow and widely felt shocks during the past week, putting residents on edge. The swarm lies near the junction of the major Sierra Madre and San Jacinto Faults.
We welcome inquiries from scientists and institutions for such an ambitious yet discounted project. Resources from ICDP, national funding agencies, and potentially other foundations could be leveraged to take advantage of this unique tectonic and temporal opportunity.
Debido a su ubicación costa afuera y una profundidad moderada, el temblor del jueves provocó pocos daños. Pero varios indicios sugieren que la suerte de El Salvador no durará por mucho más. Este evento también resalta el creciente número de terremotos extensionales grandes: una tendencia global con implicaciones de peligro importantes.
Because of its offshore location and moderate depth, Thursday’s shock did little damage. But many indications suggest that El Salvador will not stay so lucky for long. This event also highlights the increasing number of large extensional earthquakes: a global trend with important hazard implications.
Un fuerte terremoto de Mw 8.0 sacudió a Perú a las 2:41 am hora local este domingo 26 de mayo de 2019, desde un epicentro dentro de la Reserva Nacional de Pacaya-Samiria en la selva tropical del Amazonas.
A magnitude-8.0 quake shook deep below the Amazon Rainforest in Peru, causing extensive liquefaction and shaking from Colombia to Chile.
A magnitude-7.5 quake broke the same fault that produced a magnitude-8.0 quake in 2000, an extraordinarily short recurrence time that also broke all our rules
An open invitation for researchers to use these remarkable Costa Rica quakes as a collaboration laboratory
Two deadly and damaging quakes late last month were probably unrelated to each other.
The authors claim they found dynamic triggering of tiny aftershocks up to 275 km (150 mi)
from an M=7.2 mainshock in 2010, but they have not proved their case.
While exact repeats of earthquakes are rare, if the 1906 quake did strike again, what will be our excuse for being so unprepared?
Malatya-Ovacık Fayı’nın Arguvan ilçesinin yakınında 21 Mart 2019 tarihinde oldukça sığ derinliklerde bir deprem etkinliği başlamış ve yüzlerce küçük deprem olmuştur
In one case, the fault rupture and its associated seismicity had been shifted toward a volcano in support of the author’s hypothesis; in the other, seismograms from temporary near-fault stations had been manufactured. In both cases, evaluation committees and universities called for retractions.
Un sismo de magnitud 6.1 ocurrió el 23 de marzo de 2019 a las 2:14 de la tarde en Colombia. Un artículo científico reciente informa que la marea podría ser responsable del 16% de los terremotos en Colombia. Pero, ¿la Luna provocó este terremoto? Posiblemente, pero hay limitaciones importantes.
A magnitude 6.1 earthquake occurred on 23 March 2019 at 2:14 pm in Colombia. A recent scientific paper reports that the tide might be responsible for 16% of the earthquakes in Colombia. But did the Moon trigger this earthquake?
Morfolojik ve jeolojik olarak oldukça belirgin olan Acıpayam baseninde 20 Mart 2019’da Mw=5.7 büyüklüğündeki kuvvetli bir deprem olmuş, deprem çok sayıda kırsal yapıda hasara neden olmuştur.
Solo el 16% de la energía que fue liberada por el sismo M = 7 se convirtió en ondas sísmicas, que son responsables por el daño. Sin embargo, el sismo produjo la sacudida de roca madre más fuerte jamás registrada. Si más de su energía se hubiera transformado en ondas, su efecto habría sido mucho mayor.
The magnitude 7.1 earthquake, which struck Mexico City on 19 September 2017, caused devastation in the city and its surroundings. 369 people died, 57 buildings collapsed, and a much larger number was seriously damaged.
A new model joins two others in confirming the hazard posed by the tectonic forces that are squeezing and shearing greater LA.
India is one of the countries with the most earthquake-related deaths. Just in the past century, over 100.000 people have died due to earthquakes in the country (Bilham, 2009)
Ross S. Stein, Ph.D., Temblor, Inc. On February 3, a Magnitude 4.5 quake struck 30 mi (50 km) south of Eureka, followed in rapid succession by four more Magnitude 3+ …
La megafalla de cabalgamiento carece de grandes terremotos en la zona de subducción en esta región. ¿Qué nos dicen estos terremotos extensionales?
The swarm appears to be occurring on a right-lateral reverse fault that connects the San Andreas and Mendocino Fracture Zone with the shallow portion of the Cascadia Megathrust.
The megathrust fault lacks large subduction zone earthquakes in this region. What do these extensional earthquakes tell us?
El terremoto se encuentra rodeado por recientes grandes terremotos; es incierto si uno pudiera ocurrir aquí
The earthquake is surrounded by recent great quakes; whether one could strike here is uncertain
Raul Madariaga: “Es claro para varios de nosotros que la región de Coquimbo tiene una sismicidad inusual y en aumento que podría preparar el área para un terremoto muy grande cerca del final de este sigo.”
The Coquimbo region has an unusual, increasing seismicity that may be preparing the area for a very large earthquake – Prof. Raul Madariaga
One may think that these quakes are small, so why do they matter? Why should I care?
The partial shutdown could make things worse
Japanese authorities declared the Jan 3 shock to be an independent event; we argue that it was a product of the 2016 quake, which profoundly changed the hazard.
Il “gigante buono”. “Mamma”. “Sua Maestà”. Così i Siciliani usano chiamare l’Etna, uno dei vulcani più attivi e monitorati al mondo.
In Pennisi, the statue of Saint Emidio, protector from earthquakes, collapsed.
Tsunami, Eruption, and earthquake risk is not over
Denizaltında deprem olmadan oluşan bu tsunami, volkanın yarattığı heyelan ve kütle hareketlerinin önemli bir sonucu olarak kayıtlara geçmiştir.
Opening Presentation for the Centennial Plenary Session at the American Geophysical Union 2018 Fall Meeting in Washington, D.C.
Building Codes Work. The closer you are the stronger you are shaken. Liquefaction is a menace
Bölgenin sismo-tektonik yapısı hasar yapıcı deprem yaratma potansiyeli barındırmaktadır.
A tensional shock in a compressional setting strongly shook Anchorage, perhaps the U.S. city best rehearsed for earthquakes
After centuries of abuse, our actions have led to changes that are affecting everyone, now and into the future
Jason R. Patton, Ph.D., Ross Stein, Ph.D., Volkan Sevilgen, M.Sc. Water Management: Levees and Subsidence The state of California provides a substantial proportion of food for our country and other …
Jason R. Patton, Ph.D., Ross Stein, Ph.D., Volkan Sevilgen, M.Sc. An earthquake with a magnitude of M = 6.8 earthquake struck today along the coast of Greece, preceded by a …
Jason R. Patton, Ph.D., Ross Stein, Ph.D., Volkan Sevilgen, M.Sc. It Has Happened Before The southern San Andreas fault (SSAF) is a plate boundary strike-slip fault, where the Pacific …
by Amar Rahman (Principal Risk Engineer / Global Practice Leader Natural Hazards at Zurich Insurance Company Ltd)
Landslides during and following the M=7.5 earthquake in central Sulawesi, Indonesia possibly caused the majority of casualties from this catastrophic natural disaster.
by Abdul Muhari (Ministry of Marine Affairs and Fisheries, Indonesia), Fumihiko Imamura (International Research Institute of Disaster Sciences IRIDeS, Tohoku University, Japan), Taro Arikawa (Chuo University, Japan), and Bagus Afriyanto (Ministry of Marine Affairs and Fisheries, Indonesia)
An earthquake with a magnitude of M = 7.0 earthquake struck today in New Britain, Papua New Guinea. New Britain is an island northeast of the Island of Papua New Guinea and Australia.
An M=7.5 earthquake hits Sulawesi. Three major disasters are unfolding: damage from ground shaking, damage from landslides, and damage from tsunami. We learn more every day as information is conveyed across social media. Soon geologists will have their boots on the ground to compile scientific observations so we will be able to reconstruct what happened.
The earthquake struck on the Palu-Koro fault, with a faster slip rate than the San Andreas, and is straddled by the city of Palu, with a population of about 340,000.
This squeeze was likely behind the 1971 Sylmar, 1987 Whittier Narrows and 1994 Northridge thrust earthquakes
Last week, the M=6.6 Hokkaido earthquake struck the southern region of Hokkaido island, near the city of Sapporo in Japan. The earthquake caused widespread electricity blackouts and multiple large landslides.
Better understanding of driving mechanisms behind earthquakes will help us to better forecast seismic hazard related to induced seismicity
11 Eylül 2018 ve 12 Eylül 2018 de sırasıyla mb:4.9 ve Mw:5.2 büyüklüğünde olan depremler derin depremler olarak kayda geçmiştir
El próximo terremoto de M~7 podría ocurrir dentro de los siguientes 5 a 10 años
The next M~7 could occur within 5 to 10 years
The new bill puts a greater emphasis on seismic safety.
The magnitude 6.6 Sapporo earthquake occurred along the southern part of Hokkaido, Japan
An earthquake swarm in Indonesia, lasting more than three weeks, has left nearly 500 people dead.
There are no reported fatalities from yesterday’s earthquake.
Yesterday’s quake struck Italy’s Molise region, an area known for its castles and churches.
L’INGV ha registrato un terremoto di magnitudo 4.6 a 19 km di profondità, nella zona di Montecilfone (CB).
Sunday’s M=6.4 earthquake was the largest ever recorded in Alaska’s North Slope region.
Yesterday’s M=6.9 earthquake is an aftershock of a M=6.4 quake a week earlier.