Articles tagged with Seismology
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Researchers have discovered that an earthquake can cause damage to a neighboring fault line, potentially leading to more earthquakes. The study, led by UCLA's Vidale, measured seismic wave speed to detect this effect and found it in the Landers fault, which is 10 miles away from the Hector Mine fault.
Researchers found that small-magnitude earthquakes and micro-cracking in a region called the process zone precede propagation, followed by nucleation of the rift axis and upwelling of magma. This new understanding can be applied to more complex rift settings in oceans and continents.
Researchers have made key findings about the San Andreas fault system, predicting major earthquakes within 30 years for certain areas. The study, which analyzed paleoseismic data from 10 sites, suggests that at least 120 miles of the southernmost section of the fault may rupture in a large earthquake of magnitude 7.6 to 7.8.
The University of California, Berkeley, has deployed a first permanent broadband earthquake monitor in Monterey Bay, which will measure earthquake activity from the ocean side of the fractured fault zone. The instrument aims to reveal new information about seismic activity on the Pacific Plate and improve understanding of earthquakes.
Geologists reconstructed the Eridanos Delta's course and discovered that climate influenced its development. Numerical models predict river dynamics over hundreds of years, helping to answer questions about climate change impacts on rivers.
Researchers have made significant discoveries about the San Andreas Fault using a new technique for seismic imaging. The study has provided valuable information on the properties of rocks near the surface and the deep fault line, shedding light on the potential risks and opportunities associated with drilling through the fault.
Researchers identify a consistent seismic pattern suggesting a recurrence time of 1,500-2,500 years for the 1356 Basel earthquake. This discovery could help safeguard infrastructure and fine-tune emergency procedures before a potential major earthquake strikes.
The National Science Foundation (NSF) has funded a virtual collaborative research network called NEESgrid. This initiative aims to improve seismic design and hazard mitigation by providing researchers with access to cutting-edge computational tools and experimental equipment, enabling them to share data and resources.
Scientists investigated subducting lithosphere and deep earthquakes near Fiji, finding a group of deep earthquakes off to the side that cannot be connected to the actively subducting lithosphere. The researchers suggest that similar slabs may exist elsewhere, preserving a significant primordial component of the mantle.
Researchers used computer simulations to analyze the Chicxulub impact crater, revealing that it may have behaved like a fluid during its formation. This finding could help explain the complex internal structures observed in the crater and shed light on the environmental effects of large-impact craters.
Researchers found that the northern Hayward fault slips at a rate of 5-7 millimeters per year, similar to the surface, indicating it is not locked and releasing built-up strain. This reduces the threat of a major quake on this segment, but other hazards remain high.
A new analysis by University of Colorado at Boulder professor Karl Mueller indicates a high threat of large earthquake in the New Madrid seismic zone. The study gathered evidence on a pivotal 'blind-thrust' fault and found a slip rate of nearly 45 feet over 2,300 years, posing significant risks to Memphis and St. Louis.
A team of researchers is using seismic equipment to map the Earth's structure beneath the Rocky Mountains, aiming to understand how ancient land masses collided to form the continent. By analyzing density and material properties of rocks, they hope to visualize the structure of what lies far under the Earth's surface.
A team of scientists will conduct seismic experiments along a 600-mile route, using specialized instruments and explosions to create detailed profiles of the Earth's crust. The project aims to gain insight into the formation of the Rockies and improve knowledge of earthquake hazards, natural resources, and water resources.
USGS scientists will present findings on prehistoric earthquakes, seismic hazards, and the structure of the Seattle basin. The presentations will provide insights into the probabilities for future earthquakes in the Seattle area and the current seismic hazards of the Pacific Northwest.
New study using GPS satellites tracks ground motions in Midwest seismic zone, revealing little to no motion across the area. The results suggest National Seismic Hazard maps should be revised to reflect lower estimates of earthquake risk, potentially leading to cost savings for new construction.
Researchers have discovered two distinct rock types at the base of the mantle, which are moving laterally and interacting with the liquid iron outer core. This finding has significant implications for plate tectonics and our understanding of the Earth's geological history.
Researchers at Carnegie Institution use X-ray diffraction to determine iron's elasticity at high pressures, which could explain seismic anisotropy in the inner core. The findings suggest the inner core is close to melting and may contain additional components with low shear-wave velocities.
Scientists have provided direct evidence that the Earth's innermost core is solid, contradicting a long-held assumption of a liquid core. This finding was made possible by advances in instrumentation and computer capabilities, allowing researchers to detect the characteristic vibrations of a solid core.
Researchers from the Max Planck Institute for Chemistry studied the stability of materials relevant to the lower mantle under very high pressures and temperatures. Their findings indicate that partial melting is more likely than previously thought to explain seismic anomalies in this region.
A strong consensus has emerged among US seismologists that the seismic network would have detected a blast equivalent to 800 tons of TNT, leading some experts to conclude that India's second round of tests were small and designed to test nuclear bomb components. Pakistan conducted its own nuclear tests shortly after.
The USGS has released a new seismic hazard map for the Western Hemisphere, providing a comprehensive tool for assessing potential earthquake damage. The map is the result of nearly a decade of cooperative work by scientists from around the world and will be available online and in various publications late this year.
A new study published in Nature has provided the first evidence of reduced sediment amplification in Southern California during large earthquakes, shifting the debate towards the engineering view. The research suggests that seismic hazard posed by local sediments may be underestimated in current engineering practices.
Scientists are studying the Hayward Fault, South Bay Stepover, and Loma Prieta to better understand their movement patterns. They found that some portions of the fault have locked up, leading to unrelieved stress at greater depths, while others exhibit complex creeping behavior.
Researchers Paul Richards and Won-Young Kim analyze seismic data to verify the Comprehensive Test Ban Treaty, concluding the event was an earthquake with 'excellent' monitoring capability
Scientists from the National Science Foundation and IRIS have ruled out cult activities and nuclear detonations as causes of a 1993 Australian seismic event. They now believe that an iron meteorite of about two meters in diameter could have created the tremors, but no crater has been found.
Researchers analyzed seismic data to determine cause of 1993 event in Australian outback. An iron meteorite over 3 meters in diameter is suggested as possible cause.
The NSF is installing 250 ground-based monuments to track satellites and study earth movements in Southern California, enabling scientists to follow Earth's crust movements with unprecedented detail. The network will provide valuable insights into earthquake potential and strain buildup, helping to identify areas of high seismic activity.
The USGS National Earthquake Information Center lost near real-time data from the AT&T Telstar 401 satellite, but regional networks and cooperation with other seismic networks maintained earthquake monitoring. Smaller earthquakes are now harder to track due to slower reporting times.
The California Department of Conservation has released six preliminary seismic hazard zone maps, highlighting areas susceptible to landslides and liquefaction in San Francisco and Southern California. The maps will help local governments identify areas requiring geologic or soil investigation before urban development permits are issued.
The US has signed the Comprehensive Test Ban Treaty, which will be verified through a global seismic monitoring system. The treaty bans nuclear testing in all environments except underground, and the global network is being installed by IRIS and the National Science Foundation to detect seismic events of magnitude 4.25 or larger.