Articles tagged with Seismology
Researchers have developed a new model to evaluate seismic wave velocities at shallow depth in the Seattle Basin, offering refined seismic hazard assessments. The study also exposes two faults in the eastern Sierra Nevada, providing new details about active faulting in the area.
Researchers warn that building codes may overestimate safety in regions prone to both seismic and wind hazards, increasing the risk of structural damage. A new method assesses combined risks using a common metric, showing that dual-hazard conditions can double the risk of failure.
The study shows that the fault involved in the 2010 El Mayor-Cucapah earthquake was simple on the surface but complicated at depth. Researchers used a combination of GPS data, remote sensing techniques, and seismological data to produce an extremely well-resolved model of the earthquake.
Scientists at University of Nevada, Reno observed an upper limit of three on the number of fault jumps through which an earthquake is likely to rupture. This finding helps reduce uncertainties in estimating earthquake sizes in complex fault systems.
Scientists at Georgia Tech analyzed data from the March 11 Japan earthquake, finding that subsurface materials were weakened by as much as 70%, affecting how faults deliver movement to buildings and bridges. The study could improve building design and help predict effects of rare and extremely powerful events.
A Spanish research team used 3D reflection seismology to create detailed images of the Ebro river basin six million years ago. The study reveals that the sea level dropped dramatically during this period, exposing continental margins to atmospheric agents.
The study reveals the spatial compactness of the event, with a 250-kilometer-long fault experiencing significant slip, and high- and low-frequency seismic waves coming from different areas of the fault. This information will help scientists improve infrastructure and prevent loss of life through better application of seismological data.
Researchers from the University of Hawaii at Manoa used GPS data to find that a section of the eastern Andes is locked in place, allowing stress to build up and potentially leading to large earthquakes. The study suggests that earthquakes with magnitudes up to 8.9 are possible in the region.
A team of scientists led by Rice University geologist Alan Levander has figured out why the Colorado Plateau is rising even as parts of its lower crust appear to be falling. The region's uplift is caused by magmatic material from the depths slowly rising to invade the lithosphere, causing layers to peel away and sink.
Kojiro Irikura will be honored with the Bruce A. Bolt Medal at the Seismological Society of America's annual meeting for his leadership in strong-motion earthquake data analysis in Japan.
The new study creates a detailed image of the Yellowstone plume's electrical conductivity, showing it dips more gently and extends farther east-west. The geoelectric image suggests the plume may be enveloped by a broader sheath of partly molten rock and liquids.
Experts gather to discuss the state of knowledge about the New Madrid Seismic Zone, a region prone to large earthquakes with significant economic losses. Researchers also explore computer simulations of earthquake ground motion in the zone, aiming to understand and anticipate future events.
Researchers developed a new system, RTerg, that can identify tsunami earthquakes in real-time, giving local residents minutes to evacuate. The system uses algorithmic tools to analyze seismic data and sends alerts to warning centers, potentially saving lives.
Researchers at Georgia Institute of Technology found a statistically significant increase in microearthquakes after the Chilean earthquake in February. The study suggests that seismic waves from distant earthquakes can trigger events on the other side of the Earth, with secondary and tertiary waves playing a key role.
Male Schizococa ocreata wolf spiders adjust their signaling modes based on environment to increase mating chances. In natural habitats, vibrations on leaf litter were found to be significantly more effective than other substrates, leading to successful mating over 85% of the time.
Researchers have found that seismic noise from storms in the South Atlantic Ocean and 'footquakes' from soccer matches can be detected by broadband seismometers. The discovery was made using cross-correlation analysis, which reveals a signal that varies with storm intensity.
Researchers, like Virginia Tech's Russell A. Green, focus on paleoseismology and soil liquefaction to calculate annual probability of specific losses due to seismic events. This work aims to implement performance-based earthquake engineering (PBEE) concepts to reduce seismic risk.
Recent studies shed light on ancient C4 plants, submarine channels with helical flow reversal, and the genesis of granite. Researchers have also discovered mysterious rock layers containing petrified remains, cohabiting bacteria in ancient environments, and deep-cave stromatolites.
The 'M8' simulation, a magnitude 8.0 earthquake on the southern San Andreas Fault, shakes a larger area with greater detail than previously possible. The development of this simulation advances state-of-the-art in speed and efficiency for such calculations.
New data suggests that the Limon and Pedro Miguel faults in Central Panama have ruptured both independently and in unison over the past 1400 years. This indicates a significant seismic risk for Panama City and the Panama Canal, with displacements of up to 3 meters recorded.
Researchers at the University of Bristol have developed a method to measure the movement of the Earth's deep interior, which controls continents and ocean locations. This technique uses seismic waves to study the properties of a mysterious layer called D″, where the mantle meets the core.
A Purdue-led research team found a previously unmapped fault, the Léogène fault, was responsible for the devastating Haiti quake. The newly discovered fault runs parallel to the Enriquillo fault and remains ready to produce large earthquakes, threatening Haiti's stability.
The University of Nevada, Reno's earthquake engineering lab is expanding with a $12.2 million grant from the US Department of Commerce's National Institute of Standards and Technology. The new facility will house the largest shake table in the US and enable researchers to simulate complex seismic tests.
Researchers successfully recreated the extreme conditions found at the Earth's core-mantle boundary, enabling them to study the behavior of a unique mineral called post-perovskite. This discovery sheds light on how seismic waves travel through this region and provides insights into Earth's internal heating and cooling processes.
Researchers successfully recreated the conditions deep in the Earth's mantle to study the behavior of post-perovskite, a mineral that helps explain faster seismic waves. The discovery provides new insights into the earth's internal heating and cooling processes.
Researchers confirm partial melting of mantle at 2900 km depth, revealing a deep magma ocean. The study uses X-ray diffraction to characterize the passage from solid to liquid state, shedding light on the dynamics and composition of the Earth's depths.
A magnitude-8.1 earthquake triggered two major quakes of magnitude 7.8 within two minutes, affecting Samoa, American Samoa, and Tonga, with water levels reaching 49 feet above sea level
A magnitude-8.1 earthquake triggered two major quakes of magnitude 7.8 within two minutes, revealing a unprecedented pattern in the Samoa-Tonga region. The study suggests that normal fault earthquakes can trigger subduction zone quakes, affecting tsunami hazard calculations globally.
Researchers identified two apparent faults cutting young deposits near Olympia, Washington, suggesting recent fault activity and potential earthquake hazards. The study utilizes marine seismic reflection data to explore shallow structures associated with inferred faults in the Tacoma and Olympia areas.
A revised seismotectonic model for the California Central Coast identifies new faults and reinterprets known ones, highlighting the need for further study to understand seismic hazards. The study also examines how large earthquakes can trigger other large earthquakes on nearby faults, a phenomenon observed in paleoseismic records.
The July-August GSA Bulletin highlights recent research on slow-slip phenomena in Cascadia, revealing a new understanding of how plate motion stresses are relieved. In southern Tibet, Permian extension- and arc-type magmatism is documented, challenging traditional views on the region's paleogeography.
Researchers from the Alfred Wegener Institute have developed a novel vibroseismic measurement method to investigate the internal structure of Antarctic ice shelves. This technique allows for more efficient and environmentally friendly data collection, enabling better forecasts of future sea level changes.
Scientists discovered that aseismic slip in the Nazca tectonic plate can prevent earthquakes from propagating through certain areas. By analyzing GPS data and aftershock patterns, researchers found a 'patchwork' pattern of aseismicity, with some areas always slipping slowly and others rarely experiencing seismic activity.
The USGS is providing $7 million in funding for earthquake monitoring to support the development of the Advanced National Seismic System (ANSS). This initiative will enhance the country's ability to detect and respond to earthquakes, ultimately saving lives and reducing economic losses.
Art Frankel led a team to update national seismic hazard maps, vastly improving public policy and building codes across the US. The new maps were used directly in building codes, enhancing earthquake safety nationwide.
David Boore developed a well-known method for computing estimates of ground motion from simulated earthquakes, known as SMSIM. His work has advanced understanding of strong-motion seismology and influenced seismic building standards worldwide.
Richards' work on deep-Earth research led to a better understanding of the Earth's inner-core rotation and the detection of seismic waves. He also applied seismological methods to study nuclear weapon test explosions and their implications in politics and science.
A Rensselaer Polytechnic Institute professor and his team are monitoring aftershocks in Chile following a massive 8.8-magnitude earthquake on Feb. 27. The 10-member team installed over 50 broadband seismometers to record seismic activity along a 500-kilometer zone, providing valuable data for understanding the earthquake's impact.
Researchers found a plausible cause for small earthquakes in North Texas linked to the operation of a saltwater injection disposal well. The study suggests that fluid injection may have affected tectonic stress, reactivating faults and generating quakes.
Scientists are using infrasound to monitor volcanoes in the Northern Mariana Islands, a U.S. commonwealth, for early warning of eruptions that could threaten passenger airlines and cargo ships. The technology aims to discriminate between different eruptive styles, improving alert systems for volcanic ash clouds.
A new study by an international team has used seafloor seismometers to image the Hawaiian mantle, revealing a high-temperature plume from the lower mantle. The findings suggest that the Hawaiian hot spot is the result of this upwelling plume, which tilts southeastward as it extends downward.
Seismic images of a mantle plume extending to depths of at least 1,500 kilometers reveal the roots of Hawaii's volcanic hotspot. The PLUME project provides high-resolution seismic images of the structure beneath the island of Hawaii.
Researchers have observed dynamic upwelling in the underlying mantle beneath a spreading center, leading to new crust formation. This finding resolves a long-standing debate regarding the relative importance of passive and dynamic upwelling in oceanic crust creation.
Scientists are concerned about the buildup of carbon dioxide and methane gas in Lake Kivu, which could lead to a catastrophic explosion. The lake's unique combination of geological features and lack of circulation makes it vulnerable to disturbances, posing a threat to the approximately 2 million people living nearby.
Researchers aim to correlate seismic activity with glacier slip using pump tests and measurements of natural seismicity. The projects focus on stability of ice stream grounding zones and role of active subglacial lakes in ice sheet loss.
The UCLA center will continue to serve as a key site for the George E. Brown Jr. Network for Earthquake Engineering Simulation (NEES), facilitating cutting-edge research on seismic vulnerability and disaster preparedness. The center's state-of-the-art mobile field laboratory will enable researchers to test full-scale specimens under re...
A 2004 Sumatran earthquake may have weakened a portion of California's San Andreas Fault, changing its fault strength and potentially triggering increased global seismic activity. The study, published in Nature, examined seismic records from Parkfield, Calif., and found repeated microearthquakes occurred near the fault
Researchers investigate strange river behavior in Arizona, attributing it to ancient tectonic extension. In another paper, scientists study active low-angle normal faults in Mexico, resolving a long-standing controversy on their existence.
A team of researchers will conduct the largest earthquake simulation on a wooden structure, exposing a seven-story building to forces of an ancient earthquake. The goal is to develop new design approaches for stronger and safer wooden buildings.
The Deepsea Drilling Vessel CHIKYU has begun riser-drilling operations in the Nankai Trough Seismogenic Zone, targeting a depth of 1,600 meters. This marks a significant milestone in ocean drilling, as CHIKYU becomes the first vessel capable of drilling deep beneath the ocean floor and in seismogenic zones.
The University of Nevada, Reno's Seismological Lab is conducting a seismic survey through downtown Reno to create an earthquake hazard map. The team, led by Professor John Louie, is using industry techniques to map suspected faults and confirm previous findings.
A new study evaluates expected ground motion in Seattle, Victoria, and Vancouver from earthquakes of magnitude 7.5 - 9.0, providing a tool to build or retrofit structures to withstand seismic waves. Ground motions are estimated for firm ground at the three sites, with a model that engineers can adjust for local soil conditions.
A UT Knoxville-led research project is exploring the East Tennessee Seismic Zone (ETSZ) to better understand seismic activity and its impact on future earthquakes. The study aims to provide new information on past quakes and inform the planning of new large engineered structures.
Studies investigate the relationship between mantle cooling, crustal thickness, and sea-level rise. Researchers also explore the impact of tectonic stretching on fault formation and the behavior of Earth's plates.
The BSSA special issue on rotational seismology discusses research on rotational ground motions, including theory, instrumentation, observation, and interpretation. Rotational effects from earthquakes have been observed for centuries, but were ignored due to practical difficulties in measuring them.
Recent observations from the USArray transportable array and EarthScope instruments have shed new light on seismic wave propagation and the evolution of the Yellowstone hotspot. The analysis suggests a common mantle source for the region's unique topographic features, providing valuable insights into geological processes.
Researchers are re-evaluating earthquake potential in the Central Coast region, a high-risk area with significant population growth. Fresh data from multiple datasets will focus on faults including the Hosgri Fault Zone and highlight newly identified features such as a linear trend of seismicity and magnetic anomalies.
A giant Cascadian earthquake could cause severe damage and possible collapse in Seattle's high-rise buildings, particularly those constructed before 1994 building code changes. The Seattle basin amplifies long-period motions, making tall steel buildings susceptible to low-frequency shaking.
A massive earthquake swarm in Yellowstone National Park was analyzed by SSA researchers, revealing epicenter migration and sudden depth changes. The study suggests that hydrothermal fluids may be responsible for the swarm's source properties.
A University of Nevada, Reno alumna's innovative straw bale house design survived a 200% increase in acceleration than the 1994 Northridge quake. The structure, built using locally sourced materials and labor, demonstrated exceptional seismic performance, surpassing estimates for the 2005 Kashmir earthquake.