Scientists at Los Alamos National Laboratory developed a new method to detect underground nuclear explosions by coupling seismic models with gas-flow models. The research improves the accuracy of predicting radionuclide gas transport through fracture networks, enabling better detection and concentration of gases.
Researchers deployed seismometers to create maps of seismic velocities beneath the West Antarctic Rift System, revealing a hot zone beneath the Bentley Subglacial Trench. This discovery suggests that the rift system was active recently and may have implications for the future of the giant ice sheet in Antarctica.
A new algorithm called Fingerprint And Similarity Thresholding (FAST) can identify previously overlooked microquakes in large databases of ground motion measurements, potentially helping predict larger quakes. By comparing seismic wave patterns, FAST finds weakly recorded earthquakes faster than conventional methods.
Scholz has made significant contributions to seismology, bridging laboratory studies of rock mechanics with fundamental research on crustal-scale deformation. He has developed influential models for earthquake prediction and helped create regional seismic hazard maps.
Yingcai Zheng, an assistant professor at the University of Houston, has received the 2015 J. Clarence Karcher Award for his significant contributions to exploration geophysics. His research focuses on characterizing fractured reservoirs, a key area of study in the field.
Researchers use asteroseismology to track waves through stars and determine internal properties, finding nearly a million times stronger magnetic fields than typical refrigerator magnets. This technique allows probing of previously hidden regions of stars.
Inserm researchers have developed a noninvasive brain imaging method using MRI that provides the same information as physical palpation, allowing for early diagnosis of brain tumors or Alzheimer's disease. The technique uses noise correlation to detect natural shear waves in the brain, enabling building images of the brain's elasticity.
A new model of Earth's core formation suggests the magma ocean started out oxidized and became reduced over time through oxygen incorporation into the core. Higher oxygen concentrations were found in the core, contradicting previous estimates.
Researchers used data from the Earth's gravity field, topography, seismology, and crustal structure to create a 3D model of the North American craton. The study found that the lower part of the craton's root has shifted by approximately 850 kilometers towards the west-southwest due to mantle flow.
Researchers have identified a key factor driving intraplate seismicity: convective currents of semi-liquid rock beneath the Earth's crust. This process interacts with surface motion, influencing earthquake locations and frequency. The study's findings offer new insights into seismic hazard mapping in plate interiors.
Researchers reconstruct Pangea's plate thickness before its break-up, finding a boomerang-shaped arc formed by thick plates. The study reveals the boomerang's shape is controlled by plate thickness and deformation.
The Geological Society of America (GSA) and its partners have awarded funding to support 25 undergraduate and graduate students attending the SACNAS and GSA national conferences in November 2015. The students will gain knowledge, access to peers and colleagues, and career opportunities through networking and mentoring experiences.
Dr. Hiroo Kanamori received the Marcus Milling Legendary Geoscientist Medal for his pioneering discoveries in understanding large earthquakes and developing scaling relations between earthquake parameters. His work has allowed geoscientists to better predict tsunami-prone communities.
Researchers created a method to determine source characteristics of near-earth surface explosions using seismic stations in Turkey. They found the Syrian tunnel bomb blast was likely around 40 tons, contradicting initial claims of 60 tons. The technique serves as a forensic tool for investigators and governmental agencies.
Research suggests Catalina Island is sinking approximately one foot every thousand years, disappearing in three million years. The island's subsidence may pose a small tsunami risk for Los Angeles if landslides occur along active faults.
The 2011 Tohoku-Oki earthquake was measured directly from space 450 kilometers above the planet's surface. The Gravity Recovery and Climate Experiment (GRACE) satellites captured the significant ionospheric signature produced by the quake's infrasonic wave output.
A new study suggests that the Garlock fault in southern California experiences 'super-cycle' changes in strain over thousand-year timescales, leading to clustered earthquakes. The findings indicate a potential large-scale coordination of earthquakes along a single fault system.
A SMU-led seismology team reveals that high volumes of wastewater injection combined with saltwater extraction from natural gas wells is the most likely cause of earthquakes occurring near Azle, Texas. The study used a sophisticated 3D model to assess fluid pressure changes in the affected area.
John Anderson's work has contributed to the development of strong-motion earthquake data networks globally, including Mexico, Turkey, Los Angeles, and Eastern U.S. His research on seismic hazard assessment and ground-motion prediction equations has also informed policy for improved seismic safety.
A new system using sound waves helps detect structural defects in pipes, engines, and nuclear power plants. Researchers have developed a non-destructive testing method that could also be applied to medical imaging and seismology.
Researchers have created a new method to observe subsurface structures using ambient ocean waves, offering real-time monitoring of offshore oil and gas fields with less disruption to marine life. This technique reduces costs and environmental concerns associated with traditional seismic surveys.
Astronomers have discovered a star that is 11.2 billion years old and has at least five Earth-size planets, revealing that planetary formation occurred throughout the universe's history. The system, Kepler-444, consists of five planets with sizes between Mercury and Venus, orbiting a smaller star than our sun.
The study establishes form-invariance of electromagnetic, sound, and elastic wave equations without assuming relations between field variables. New locally accurate elastodynamic equations for inhomogeneous media are derived, leading to the design of perfect elastic wave rotators and cloaks.
A team led by UW-Madison is investigating the Laguna del Maule volcanic field in Chile's Andes, where a mega-eruption could be as large as Mount St. Helens. The team aims to document the volcano's behavior before an eruption using geology, geochemistry, and seismology techniques.
A team of researchers has discovered an ancient, deep canyon in South Tibet, which rules out a popular model explaining the formation of Himalayan gorges. The canyon is thousands of feet deep and was carved by a river that once flowed into the Tibetan Plateau.
Researchers discovered a previously unknown dense rock structure in the Earth's crust beneath Chile, influencing the size of a massive earthquake. The structure played a key role in slowing down the rupture, generating stronger shaking at the surface.
Dr. James Davis is being honored by the geoscience community for his work in advancing earthquake hazards preparedness and mitigation in the US. He has helped shape how geoscientists communicate with the public about seismic environments, and has been instrumental in implementing the Seismic Hazards Mapping Act in California.
Researchers confirm that textbook theory behind volcanoes is incorrect, with no evidence for narrow mantle plumes. Instead, large, slow-moving chunks of mantle drive volcano formation through plate tectonics.
Experts argue that OEF is essential for reducing earthquake risk by providing authoritative information to policymakers and the public. Key findings include the potential for significant changes in earthquake probabilities over time, influenced by local seismic activity.
Scientists have discovered two separate phases of ferromagnesian silicate in the lower mantle, one containing nearly no iron and the other rich in iron. This finding has significant implications for seismology and the study of earthquakes, highlighting the need to reconsider existing models.
Scripps scientists find evidence of super-fast deep earthquakes that rupture at depths of over 400 km, offering new clues about the forces behind these events. This discovery provides insights into fast-breaking earthquakes near Earth's surface.
A new type of Digital Zenith Telescope prototype has been developed in China, utilizing CCD camera and high-precision tiltmeter to improve efficiency and accuracy. The instrument can measure the deflection of the vertical and variations of the local plumb line, with single-observation accuracy up to 0.15-0.3
Researchers analyzed the Chile earthquake of February 2010, finding that fluid pressure in rocks affects earthquake rupture processes. The study revealed that mechanical coupling between plates controls stress build-up and seismic energy release, with fluid pressure variations linked to subduction zone dynamics.
This article covers various geology topics including Mars exploration, environmental lead poisoning, earthquake hazards, the Indus Civilization collapse due to aridification event, end-Cretaceous mass extinction analysis using clumped isotope paleothermometry, and geological events such as the Tibetan Plateau's reorganization.
Deep-sea fault zones in subduction zones can transport large amounts of water from the Earth's oceans to the upper mantle. Researchers estimate that these zones could carry up to three and a half times the total amount of ocean water to the mantle.
Studies examine the role of hydrated fault zones in carrying large amounts of water from Earth's oceans to the mantle. Researchers also investigate vertical structural heterogeneities within cratonic lithosphere, shedding light on continent destruction and evolution.
Kerry Sieh's pioneering work transformed the study of earthquakes, revealing frequent but irregular recurrence. His research led to the development of paleoseismology and improved seismic hazard assessment.
A new study found that earthquake lights are more likely to occur on or near rift environments and adjacent to subvertical faults. The study analyzed 65 documented cases of earthquake lights, finding that 85% appeared spatially on or near rifts and 97% appeared adjacent to subvertical faults.
A team of scientists from the University of Houston and a filmmaker will share their discoveries about remnants of an ancient city in the Honduran rainforest, using light detection and ranging (lidar) technology. They will also showcase previously undisclosed images of apparent archeological sites.
Researchers developed large ring laser gyroscopes six orders of magnitude more sensitive than commercial instruments. These devices can measure the Earth's rotation rate with unprecedented accuracy, capturing momentum exchange between atmosphere, hydrosphere, and lithosphere.
A global murmur, then unusual silence: A recent study found that following a major Indian Ocean earthquake, global seismic rates increased for days but subsequently dropped to zero for over 95 days. Researchers attribute this quiet period to the event causing short-term dynamic stressing of a global faulting system.
A recent study suggests that a tsunami could affect the US East Coast due to the similarity in tectonic settings between offshore earthquakes and major Canadian earthquakes. The potential threat area stretches from New England to New Jersey, with several earthquake swarms detected off the Atlantic continental shelf.
Randall White, a renowned volcano seismologist, has been recognized by the Seismological Society of America (SSA) for his dedication to public service and seismic forecasting. He has saved countless lives through his work in predicting volcanic eruptions, sharing his techniques with international partners.
James R. Rice, Harvard professor, will receive the Harry Field Reid Medal for his influential research on fracture mechanics and its application to earthquake processes. His work has defined standards for numerous frontiers of research, integrating theory, experiment, and observations.
Katsuichiro Goda, a renowned civil engineer, has been awarded the Charles Richter Early Career Award for his groundbreaking work in seismic risk assessment and mitigation. His research has developed new ground-motion equations and spatial correlations models to estimate seismic losses, enabling practical solutions in risk mitigation.
Scientists at Scripps Institution of Oceanography discovered how fault zones weaken in select locations after an earthquake tipping point, creating 'melt welts'. These regions can lead to runaway slip and massive earthquakes. The study addresses the 'low heat flow paradox' and may improve earthquake prediction models.
Scientists have created a new, harmonized earthquake catalogue for Europe and the Mediterranean that spans over 1,000 years. The catalogue, known as the European-Mediterranean Earthquake Catalogue (EMEC), covers earthquakes with magnitudes of Mw 3.5 and larger in the northern part of the region, and Mw 4.0 in the southern part.
Researchers used ambient seismic noise to search for a pre-seismic signal before the 2004 Parkfield earthquake, but were unable to detect any changes. The study placed an upper limit on how large such a signal might be, depending on its duration and location.
A Caltech-led team reports on the first high-resolution observations of the 2012 Sumatra earthquake, which ruptured along multiple faults at nearly right angles. The study provides fresh insights into the possibility of complex earthquakes occurring elsewhere, including California's San Andreas fault.
Bess B. Ward has received the 2012 Procter & Gamble Award in Applied and Environmental Microbiology for her sustained influence on marine microbiology and contributions to understanding nitrogen cycling processes in low-oxygen regions of the ocean.
Researchers successfully sent highly accurate clock signals across hundreds of kilometers using optical fiber links, overcoming challenges to transmit stable signals over long distances. The achievement brings scientists closer to redefining the second and enabling ultra-precise navigation and other applications.
Scientists present latest seismological research on earthquake hazards in San Diego, focusing on the Rose Canyon fault system and offshore faults. The study aims to improve understanding of seismic hazard and define a level of hazard for future large earthquakes.
David Shelly has made a dramatic impact on the field of seismology through his pioneering work detecting and locating deep tectonic tremor. He is recognized for his outstanding contributions to seismology, challenging prevailing theories and providing new insights into earthquake behavior.
Barbara Romanowicz, a renowned seismologist and UC Berkeley professor, has made groundbreaking contributions to global seismology. Her research has been instrumental in advancing body-wave studies of the inner core and normal-mode studies of the Earth's density distribution.
Andy Michael, a USGS geophysicist, has been recognized for his transformative work on the Bulletin of the Seismological Society of America (BSSA), the premier seismology journal. His innovative refinements and modernization efforts have significantly impacted international scientific communication.
Researchers will monitor the Cascadia subduction zone's strain buildup using a new seafloor geodesy observatory. This data will aid in modeling fault slip and predicting tsunami heights, ultimately informing city planners and emergency response managers.
Researchers explore scaling relationships of slow slip events and compare them to similar laws for earthquakes, highlighting the need for further study to understand fault mechanics. A newly defined propeller-like geometry of southern San Andreas Fault may require re-thinking ground motion assessments.
Scientists have developed procedures to determine earthquake source information for smaller earthquakes in central and eastern North America. This improved catalog provides detailed information on faulting styles and geometry for these regions, contributing to assessing seismic hazards and constraining ground motion.
Geophysicists at UC Riverside are developing large-scale computer simulations to investigate earthquake fault systems. The simulations aim to provide abundant data for analyzing plate motion and earthquake events over 10,000 years.
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.