Researchers identified a bending fault line in the Pacific Ocean as the likely cause of the 7.1 magnitude Puebla earthquake, which caused significant damage in Mexico City. The study suggests that earthquakes like this one may be more common than previously thought in a region southeast of Mexico City.
The September 2017 earthquakes showcased the effectiveness of Mexico's SASMEX early warning system, which detected the magnitude 8.2 Tehuantepec earthquake and sent alerts to residents with almost two minutes' notice. However, improvements are needed to reduce processing times and ensure timely warnings for all residents.
A satellite-based earthquake early warning system called G-FAST performed well in a replay of three large earthquakes in Chile, providing accurate magnitude and epicenter estimates. The system's performance suggests it could provide early warnings for Chile's coastal communities.
Researchers at the University of Arizona and partnering universities are working on a NSF-funded project to develop buildings that won't collapse under major earthquakes. The focus is on lateral force transfer through steel collectors, which horizontally transmit earthquake forces.
A study published in Seismological Research Letters found no correlation between great earthquake rates and lunar phases or day of the year. Large earthquakes were matched with lunar phase and day data to rule out random patterns, and no significant effects were detected.
Researchers found a correlation between saltwater disposal and earthquake occurrence up to 125 km, but reducing small faults didn't affect larger earthquakes. To reduce large fluid-triggered earthquakes, injecting less water appears to be the solution.
Scientists developed a model to estimate the maximum magnitude of an earthquake caused by wastewater injection from hydraulic fracturing. The model takes into account the energy stored on nearby faults and predicts the distance an earthquake can propagate beyond an injection site.
A study on 757 children and adolescents who experienced the 2013 Ya'an earthquake in China identified three classes of symptoms: resilient, thriving, and struggling. Those transitioning from thriving to struggling were more likely to be girls with higher levels of loss and injury.
Researchers from GEOMAR and Universidad de Chile found that the 2016 earthquake released accumulated energy from a previous quake in 1960, with a slip of over 4.5 meters. This study suggests reevaluating seismic cycles for risk assessment and construction recommendations
Scientists analyzed seismic data from Japan's Hi-net network to identify changes in subsurface conditions before and after the 2016 Kumamoto earthquake. These changes, including slowed seismic velocity, may signal impending earthquakes or volcanic activity.
New study reveals that frequency and magnitude of large Himalayan earthquakes depend on tectonic plate collision rate, which controls temperature and earthquake generation areas. The team found a link between plate collisions in the Alps and Himalaya, with slower collisions increasing earthquake hazard.
Researchers have discovered a faster method for estimating large earthquake magnitudes by analyzing 'elasto-gravity' signals, which travel at the speed of light. These signals consistently arrive before seismic wave counterparts, allowing for near-real-time magnitude detection and more accurate estimates.
Researchers suggest that the Parkfield segment of the San Andreas Fault must host occasional large earthquakes to balance its seismic moment deficit. The study found that the probability of an earthquake magnitude 6 or more is around 43% over 30 years and 96% over 200 years.
A study by University of Texas at Austin researchers found that compact sediments along the Cascadia Subduction Zone increase earthquake and tsunami hazards. Compact sediments offshore of Washington and northern Oregon can lead to more stress buildup and longer rupture distances, making them prone to triggering larger tsunamis.
A Chinese research team used the Sunway TaihuLight to simulate a devastating 1976 Tangshan earthquake. The simulation created detailed 3D visualizations and informed engineering standards for buildings in seismic zones.
A team of researchers from LMU and TUM used supercomputing resources to simulate a massive earthquake with 1,500km of non-linear fracture mechanics, achieving a 13-fold improvement in time to solution. The simulation helped understand the complex process behind megathrust earthquakes, which can unleash violent tsunamis.
Researchers at Kyushu University have identified a strong influence of pre-existing faults on earthquake location and behavior in the Nankai Trough offshore Japan. The study found that aftershocks only occurred in front of an ancient accretionary prism, where stress accumulation is greatest.
The new earthquake forecast, UCERF3, provides self-consistent rupture probabilities from short-term to long-term, including increased likelihood of powerful aftershocks and revised earthquake frequencies. The model also assesses short-term changes in seismic hazard based on earthquake clustering and aftershock excitations.
Researchers simulated 50 scenarios of a magnitude-9.0 Cascadia earthquake, finding that coastal areas would be hardest hit and locations in sediment-filled basins like Seattle would shake more. The intensity of shaking can vary by a factor of 10 depending on the scenario.
A team of researchers successfully predicted earthquakes using machine learning techniques in a laboratory setting. By analyzing acoustic signals from faults, they identified a pattern that can be used to estimate the stress on the fault and predict when an earthquake will occur.
A new study suggests that a strong El Niño and a magnitude 7.8 earthquake in Ecuador in 2016 likely exacerbated the Zika virus outbreak, increasing cases by 12-fold in three months. The research highlights how climate variability can amplify the worst effects of natural disasters and disease outbreaks in socially vulnerable regions.
Researchers validated a new earthquake forecasting model based on the Amatrice-Norcia sequence, showing improved accuracy compared to existing models. The 'brick-by-brick' approach of the operational earthquake forecasting system may revolutionize seismologists' ability to forecast earthquakes.
Scientists have documented a clear-cut instance of a massive earthquake triggering slow slip events in New Zealand, some occurring as far away as 300 miles from the epicenter. This study provides new insights into the relationships between slow slip events and earthquakes.
Seismic reflection data from the 2011 Tohoku-oki earthquake revealed a frontal prism, reflective zone, and subducted horst-and-graben structures in the Japan Trench. This provides insights into the behavior of large shallow slip zones and potential tsunami earthquakes.
A computer science approach using machine learning predicts the time remaining before a fault fails by analyzing acoustic signals emitted during laboratory-created earthquakes. The technique identifies new signals, previously thought to be low-amplitude noise, that provide forecasting information throughout the earthquake cycle.
Researchers at Caltech simulated earthquakes in a lab to measure dynamic friction and its impact on seismic events. They found that slip velocity is the key factor in dynamic friction, contradicting previous assumptions.
The USGS has awarded $4.9 million to six universities and a non-profit organization to support the transition of the ShakeAlert system into a production system. The partnership aims to improve the sensor and telemetry infrastructure across the western United States.
A University of Oklahoma study reveals the complex relationship between wastewater injection and seismicity in Oklahoma. The research found that foreshocks correlated with wastewater injection rates and stress interactions between earthquakes, ultimately leading to the September 3, 2016, 5.8 magnitude earthquake near Pawnee, Oklahoma.
Researchers used repair petitions to trace damage from the magnitude 7.3 event in Aguadilla, finding a consistent picture with modern-day data. The study provides detailed 'ground truth' of the 1918 quake's impact, useful for predicting future earthquake damage.
A new study reveals that large-scale water cycles in California have a modest impact on small-scale earthquake activity. Slight changes in ground stress associated with snow accumulation, snowmelt, runoff, and irrigation for agriculture influence earthquake likelihood.
Researchers have determined the origin of the 1586 Sanriku tsunami that hit Japan, tracing it to a mega-earthquake in the Aleutian Islands. The study used coral fragments dated to the 16th century and found a precise age of 1572±21 years.
A team of scientists found that dehydration of minerals deep below the ocean floor influenced the severity of the 2004 Sumatra earthquake. The researchers used ocean drilling samples to understand the process and its potential impact on other subduction zones.
Research published in Science journal found that sediment warming contributed to the severity of the 2004 Sumatra earthquake and tsunami, killing over 250,000 people. The study suggests a similar mechanism could be at play in other subduction zones worldwide.
The study found that the Northern Lenglongling fault was a more suitable seismogenic structure for the MS6.4 Menyuan earthquake. This is supported by field geological mapping and tectonic geomorphology analysis, which indicate the LLLF has been active since the Holocene.
Researchers estimate that the next major earthquake in Istanbul will originate from the Eastern Marmara Sea due to a build-up of energy from entangled tectonic plates. This could lead to a shorter early warning period, but potentially less severe ground shaking than expected.
Researchers used deep geophysical exploration and seismic tomography to study the deep tectonic environment of strong earthquakes in North China. Key findings include a complex tectonic setting with a listric normal fault and high-angle deep fault, and a low-velocity anomaly in the middle-lower crust
A new report suggests that changes in wastewater injection rates in disposal wells may have led to the Pawnee earthquake, the largest recorded in Oklahoma since the 1950s. The quake was triggered by wastewater produced by oil and gas drilling injected back into the ground.
Researchers from Caltech discovered that fast ruptures along thrust faults can cause one side of the fault to twist away from the other, opening a gap that then snaps shut. This mechanism has the potential to change our understanding of how tsunamis are generated.
A new study reveals that faults like the San Andreas Fault can experience prolonged 'afterslip' for six to twelve years after an earthquake, unlike a similar quake in Napa, California, which showed less afterslip. This variation makes it harder to predict post-earthquake damage and infrastructure repair needs.
Researchers estimate a 43% probability of at least one magnitude 6.75 or greater earthquake in the Wasatch Front region by 2070. The study, published in 2016, predicts that 22 large earthquakes have ruptured parts of the fault zone between Nephi and Brigham City over the past 6000 years.
Researchers study Oklahoma's earthquakes to understand human-induced seismicity and its link to wastewater injection from oil and gas production. New seismic stations deployed across the state provide better insight into fore-and aftershocks and earthquake sequences.
Researchers study public knowledge about earthquake risk and building code preferences to develop effective communication strategies. The findings highlight the importance of using plain language, discussing likely outcomes, and limiting misinformation to effectively convey earthquake risk.
The Kaikoura earthquake triggered widespread slow slip events, producing simultaneous patches of slip in other areas. Ground faulting was complex, rupturing at nine to 12 faults with multiple orientations, resulting in a combined rupture length of about 180 kilometers.
A new microinsurance plan for California earthquakes aims to provide financial support to residents who fall into a 'payout zone' after an earthquake. The plan, developed by Kate Stillwell, uses data on seismic shaking intensity to create a payout zone defined by census blocks and shaking intensities.
The study successfully detected three magnitude 5 earthquakes since December 2016 without false alarms. Individual smartphones and 'smart' appliances could be part of a crowd-sourced network for earthquake early warnings in the future.
Researchers found signs of fault displacement at well-known rock outcrops in Colorado marking the end-Cretaceous asteroid impact. The study suggests massive seismic waves could have generated earthquakes as far away as Colorado.
A recent earthquake swarm in Bombay Beach, California, has demonstrated the difficulties in predicting the duration and impact of such swarms. The event, which consisted of approximately 100 small earthquakes between magnitude 2 and 4.3, highlights the challenges in modeling swarms and communicating their risk to the public.
A study of the 1755 Lisbon earthquake reveals a lack of knowledge among Portuguese citizens about tsunamis, yet most recognize the importance of learning more. The authors advocate for including historical and scientific issues in geosciences programs to address seismic risks and responses.
Researchers at Tohoku University used seismic tomography to image the three-dimensional structure of the Earth's interior, shedding new light on the deep Bonin deep earthquake. The study found that the Pacific slab is split and penetrated the lower mantle, with multiple factors contributing to its occurrence.
The 2017 seismic hazard model forecasts lower damaging ground shaking levels in the central and eastern U.S., but Oklahoma and southern Kansas still face a significant risk of induced earthquake damage. For over 3 million people, the chance of damage is similar to natural earthquakes in high-hazard areas of California.
Researchers found that involving interdisciplinary partners improved risk communication and public safety during earthquakes. Key recommendations include engaging with decision makers, developing clear warning messages, and minimizing negative impacts of inaccurate messages.
A new study maps and classifies the earthquake shaking potential across most of the Las Vegas metropolitan area, revealing that much of the ground is stiffer and potentially safer than previously thought. The site classifications could lead to reduced construction costs and improved safety measures for buildings.
Utah State University geologist Alexis Ault is investigating the earthquake history of the Wasatch Fault using nanoscale clues. She is collaborating with middle school students to explore this research, which provides a new window into processes that cause earthquakes at the nano-scale.
Researchers used data from the USGS 'Did You Feel It?' website to develop new intensity mapping for two California earthquakes. They found that including non-reporting ZIP codes improved the accuracy of seismic intensity maps, particularly at intermediate distances from the epicenter.
Scientists have developed a new modification to the Gutenberg-Richter law to better predict large earthquakes. This improved model takes into account the finite size of the Earth and provides more accurate estimates of seismic risk. The researchers hope their findings will be useful in evaluating economic losses from potential disasters.
Researchers at UBC Okanagan campus found that safety codes can result in overly reinforced bridges, wasting materials and increasing construction expenses. The study suggests a new approach to seismic design, prioritizing self-centering capability and reducing the need for costly demolitions.
A comprehensive review of post-disaster mental health issues found high rates of PTSD and depression in Japan earthquake survivors. The study highlights specific risk factors, such as resettlement and small social networks, and emphasizes the need for long-term support.
In the immediate aftermath of a devastating earthquake, Israeli tourists demonstrated remarkable leadership skills, quickly springing into action to help others. The study's findings highlight the importance of group cohesion and connection to their military background in coping with traumatic events.
A new analysis published in the Bulletin of the Seismological Society of America suggests that a tiny North Korean seismic event in May 2010 was an earthquake, not a nuclear explosion. The study's findings contradict previous reports that claimed it was a small nuclear test.
Scientists discovered that large bumps and mounds on the sea floor can cause sudden slip of tectonic plates, triggering giant earthquakes. The research, published in Nature Geoscience, could lead to more accurate models for forecasting where megathrust earthquakes are likely to occur.