Category: Temblor

Researchers have discovered a pattern in slickenlines — scratches on fault surfaces — that can be used to determine which way a fault ruptured in a past earthquake.   By …

Researchers devised a way to measure changes in ocean temperature using earthquakes. By mining historical seismic records, researchers got a glimpse of past ocean trends.   By Shi En Kim …

COVID-19 infection rates would rise if a large earthquake occurred during the pandemic. Researchers say that the number of resulting new cases depends on whether authorities prepare now.   By …

A magnitude-5.1 earthquake that recently occurred in Baja California, Mexico was felt as far as Los Angeles, California. What is the seismic risk imposed by the faults in Baja California? …

In the early 1900s, debate raged about Southern California’s earthquake risk. Intrigued by the adversaries, seismologist Susan Hough wrote a book about it.   By Alka Tripathy-Lang, Ph.D (@DrAlkaTrip)   …

A recent study shows that seismometers on the ground are behaving like magnetometers that record auroral activity in Alaska.   By Jeng Hann Chong, Cal State University Northridge   Citation: …

Location matters: Seismologists studying historical casualty estimates after large earthquakes suggest future rescue efforts should look for rural-area victims.   By Melissa L. Weber, MA (@Melwriter)   Citation: Weber, M., …

The quieting of seismic noise during the coronavirus lockdown may help scientists understand Earth’s natural vibrations.   By Elizabeth Goldbaum, Science Writer (@EFGoldbaum)   Citation: Goldbaum, E., 2020, Ground vibrations …

A fault that lies beneath north Las Vegas has now been shown to have tectonic origins — with implications for seismic hazards in Las Vegas. New research reveals when and …

An earthquake swarm under the Salton Sea appears to be calming down after a day, but scientists continue to keep a close eye on the region.

Yesterday’s magnitude-5.1 quake in western North Carolina was felt throughout the southeastern U.S. Although it came as a shock, a quake of this magnitude is not unexpected.   By John …

Scientists are getting new clues about seismic activity before large earthquakes along subduction zones by measuring tectonic wobbles in Japan and Chile.   By Chelsea Scott, Ph.D., Assistant Research Scientist, …

Computer simulations help researchers understand the range of possible outcomes of a rupture when key details of the San Andreas Fault are still unknown.   By: Shi En Kim (@goes_by_kim) …

A magnitude-7.8 quake struck near the mostly uninhabited Shumagin Islands on July 22, 2020, potentially closing a large seismic gap along the Aleutian trench.   By Elisabeth Nadin, Associate Professor, …

New research suggests that water-rich rocks present along subduction zone boundaries may cause these areas to ‘creep’ along without generating earthquakes.   By Melanie Chan, @mellojellochan   Citation: Chan, M. …

A recent study finds that ancient rock structures in Australia that formed over 500 million years ago determined the pathway of a 2016 earthquake.   By Helen Santoro, freelance science …

The 2019 Ridgecrest quakes stressed the Garlock Fault. If it ruptured in a large shock, it would likely trigger a San Andreas earthquake north of Los Angeles.   By Ross …

Smartphone usage may provide a global earthquake early warning system through crowdsourced motion detection with the MyShake app.   By Melissa L Weber, M.A., freelance science writer (@Melwriter)   Citation: …

Researchers link subducting plate angle to earthquake events that produce larger than normal tsunamis — helpful information for future tsunami risk awareness.   By: Danielle Woodring, M.S., structural geologist/science writer …

A recent paleoseismic study used a new method to identify the timing of past earthquakes that occurred in the Monterey Bay area prior to the 1906 San Francisco earthquake.   …

New high-res 3D images of a fault zone show how fluid movement causes an earthquake swarm.   By Julie Pierce Onos (@JuliePierceOnos)   Citation: Pierce Onos, J. 2020, Imaging from …

Six magnitude-5.0+ shocks have struck greater Tokyo since April 1st, part of a larger swarm that extends north to Hokkaido, at a rate that is about three times higher than …

Durante esta semana, un terremoto de magnitud 7.4 golpeó la costa del estado de Oaxaca, México. Al igual que eventos previos, este terremoto demuestra la existencia de un complejo sistema …

A magnitude-7.4 quake struck just offshore of Oaxaca, México this week. This and previous quakes highlight complex faulting and remind us of earthquake risk in the area.   By Aaron …

By Alka Tripathy-Lang, Ph.D (@DrAlkaTrip)   Delhi’s citizens anxiously await a bigger shock during an ongoing swarm-like earthquake sequence, though swarms rarely include a larger event.   Citation Tripathy-Lang, Alka, …

By: Haluk Eyidoğan, Ph.D., Professor of Seismology, Istanbul Technical University   A moderate earthquake struck the Bingöl province in eastern Turkey on Sunday. The quake occurred at the intersection between …

By: Ian Stone, Ph.D. candidate, University of Washington (@NoisyRocks)   Cascadia has experienced major earthquakes in the past. Should another occur today, the region’s cities would feel intense shaking — …

By: Miguel Neves, Ph.D. Candidate, Georgia Institute of Technology (@Waves2Miguel)   A new study examines the challenges of earthquake early warning systems, such as latency, and how to improve the …

By: Shi En Kim (@goes_by_kim)   Researchers repurpose underground fiber-optic cables for measuring soil properties in urban areas, which helps scientists determine how the soils — and thus the buildings …

By: Ross S. Stein, Ph.D. (Temblor, Inc., CEO) Shinji Toda, Ph.D. (International Research Institute for Disaster Science, Tohoku University) Volkan Sevilgen, M.Sc. (Temblor, Inc., CTO)   The magnitude-6.5 quake provides …

By Alka Tripathy-Lang, Ph.D (@DrAlkaTrip)   A shallow earthquake struck near the California-Nevada border in the early morning hours on May 15, 2020, waking people as far away as the …

By: Christian Fogerty, Science Writer (@ChristianFoger1)   Seismologists used a recently developed model to forecast aftershocks following the recent Ridgecrest earthquake sequence. Their findings revealed a short-term increase in seismic …

By Alka Tripathy-Lang, Ph.D. (@DrAlkaTrip)   A remote Alaskan volcano erupted for nine months, repeatedly disrupting aviation traffic. How can lightning help minimize ash hazards for aircraft?   Citation Tripathy-Lang, …

By: Ramesh P. Singh, Ph.D., School of Life and Environmental Sciences, Chapman University   Efficient energy transfer from the epicenter of Sunday’s magnitude-3.8 quake northeast of New Delhi, along with …

By Tiegan Hobbs, Ph.D., Postdoctoral Seismic Risk Scientist, Temblor (@THobbsGeo) Sam Montano, professor of emergency management and disaster science, talks about COVID19 and what recovery might look like. Citation: Hobbs, …

By: Deborah Kilb, Ph.D., Project Scientist, Scripps Institution of Oceanography (@Kinect_with_Sci), and Frank Vernon, Ph.D., Researcher, Scripps Institution of Oceanography   Over the last 20 years, the Anza area has …

By Laura Fattaruso, M.S., Ph.D. Candidate, UMass Amherst (@labtalk_laura)   A recent study finds that ground motions from earthquakes induced by oil and gas operations are similar to those produced …

By Tiegan Hobbs, Ph.D., Postdoctoral Seismic Risk Scientist, Temblor (@THobbsGeo) Shinji Toda, Ph.D., IRIDeS, Tohoku University A magnitude 6.5 earthquake hit a remote region of Idaho on March 31. Despite …

By Alka Tripathy-Lang, Ph.D. (@DrAlkaTrip)   The latest modeling shows that the interface between India and Eurasia may be segmented into pieces that can host earthquakes, and pieces that cannot. …

By Tiegan Hobbs, Ph.D., Postdoctoral Seismic Risk Scientist, Temblor (@THobbsGeo) As residents prepared for a pandemic, a magnitude-5.7 quake shook Salt Lake City, causing a chemical spill in the nearby …

By Noel Bartlow, Ph.D., Assistant Researcher, Berkeley Seismology Laboratory   The Cascadia Subduction Zone has occasional large earthquakes and frequent slow-slip events. A new study quantifies how these slow-slip events …

By Alka Tripathy-Lang, Ph.D. (@DrAlkaTrip)   Temblor talks to scientists Alexa van Eaton and Chris Schultz about the science behind bursts of lightning that lit up social media during Taal’s …

By Elisabeth Nadin, Ph.D., Associate Professor, University of Alaska Fairbanks, U.S. Haluk Eyidoğan, Ph.D., Professor of Seismology, Istanbul Technical University, Turkey Ali Moradi, Ph.D., Director of Iranian Seismological Center and …

By Laura Fattaruso, M.S., Ph.D. Candidate, UMass Amherst (@labtalk_laura)   A new study uses organic biomarkers to detect heat produced during large earthquakes. Scientists found several faults off the coast …

By Elisabeth Nadin, Ph.D., Associate Professor, University of Alaska Fairbanks   New research reveals that Earthquake Early Warning networks provide a timely warning of impending shaking more often than not. …

By Alberto M López, Ph.D., K. Stephen Hughes, Ph.D. and Thomas R. Hudgins, Department of Geology, University of Puerto Rico – Mayaguez Campus Elizabeth Vanacore, Ph.D. and Gisela Báez-Sánchez, B.S., …

By Alka Tripathy-Lang, Ph.D. (@DrAlkaTrip)   Since Taal began erupting last week, satellite images show surface movement around the volcano. Such rainbow imagery has flummoxed Twitter users.   Citation: Alka …

Taal Volcano, known for its picturesque crater lake, erupted suddenly on Sunday, Jan. 12, 2020, forcing evacuations of nearby villages.

By Alka Tripathy-Lang, Ph.D. (@DrAlkaTrip)   Urbanization obscures a complex fault zone on which downtown San Diego sits, but decades-old geotechnical studies reveal the faults.   Citation: Alka Tripathy-Lang (2020), …

Alberto M. López, K. Stephen Hughes, and Elizabeth Vanacore Department of Geology, University of Puerto Rico – Mayagüez Puerto Rico Seismic Network, University of Puerto Rico – Mayagüez Citation: López, …

Alberto M. López, K. Stephen Hughes, and Elizabeth Vanacore Department of Geology, University of Puerto Rico – Mayagüez Puerto Rico Seismic Network, University of Puerto Rico – Mayagüez Citation: López, …

By Alka Tripathy-Lang, Ph.D. (@DrAlkaTrip)   On Wednesday night, two small earthquakes welcomed California into the next decade.
   Citation: Alka Tripathy-Lang (2020), New year, new California quakes, Temblor, http://doi.org/10.32858/temblor.063 …

By Ross S. Stein, Ph.D., Temblor CEO   Citation: Ross S. Stein (2019), Triumphs, Conundrums, and Debates in Earthquake Forecasting and Seismic Hazards, Temblor, http://doi.org/10.32858/temblor.062   At the American Geophysical …

Evacuations in Bogotá and the suspension of transportation systems followed a magnitude-6.2 earthquake, which struck on or near where the North Andean Block grinds against South American Plate. The mainshock was followed just 15 minutes later by a magnitude-5.7 aftershock. Further large aftershocks remain a possibility

Aiming to make energy production safer, scientists developed a new model for forecasting earthquakes caused by oil and gas operations in the central U.S.

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.

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 …

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.

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.

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.

A magnitude-8.0 quake shook deep below the Amazon Rainforest in Peru, causing extensive liquefaction and shaking from Colombia to Chile.