A5049063891- earthquake and tectonic studies
- Geological and Geochemical Analysis
- Geology and Paleoclimatology Research
- Seismology and Earthquake Studies
- Earthquake Detection and Analysis
- Seismic Waves and Analysis
- High-pressure geophysics and materials
- Geological and Geophysical Studies
- Methane Hydrates and Related Phenomena
- Geological formations and processes
- Geochemistry and Geologic Mapping
- Geological Modeling and Analysis
- Landslides and related hazards
- Seismic Imaging and Inversion Techniques
- Seismic Performance and Analysis
- Radioactive element chemistry and processing
- Geological Studies and Exploration
- Atmospheric and Environmental Gas Dynamics
- Geological and Geophysical Studies Worldwide
- NMR spectroscopy and applications
- Astro and Planetary Science
- Thallium and Germanium Studies
- Molecular spectroscopy and chirality
- Spectroscopy and Quantum Chemical Studies
- Geotechnical and Geomechanical Engineering
Geologic Hazards Science Center
2015-2024
United States Geological Survey
2015-2024
Lawrence Livermore National Laboratory
2019-2023
Denver Federal Center
2023
John Wiley & Sons (United States)
2019
University of Edinburgh
2015-2019
Charles River Laboratories (Netherlands)
2019
Gateway Seminary
2018
University of Nevada, Reno
2004-2008
California Institute of Technology
2005-2008
Toward understanding the relationship between strain accumulation and release in context of mechanics earthquake mountain building process quantifying seismic hazard associated with globes largest continental thrust system, we describe late Quaternary expression paleoseismic evidence for great surface rupture earthquakes at six sites along Himalayan Frontal Thrust (HFT) system India. Our observations span a distance ∼250 km strike HFT. Uplifted truncated fluvial terrace deposits resulting...
Seismic rupture produced spectacular tectonic deformation above a 400-kilometer strip of the Sunda megathrust, offshore northern Sumatra, in March 2005. Measurements from coral microatolls and Global Positioning System stations reveal trench-parallel belts uplift up to 3 meters high on outer-arc islands 1-meter-deep subsidence trough farther trench. Surface reflects more than 11 fault slip under pronounced lessening trenchward. A saddle megathrust separates northwestern edge 2005 great 2004...
Abstract The 6 February 2023 Mw 7.8 Pazarcık and subsequent 7.5 Elbistan earthquakes generated strong ground shaking that resulted in catastrophic human economic loss across south-central Türkiye northwest Syria. rapid characterization of the earthquakes, including their location, size, fault geometries, slip kinematics, is critical to estimate impact significant seismic events. U.S. Geological Survey National Earthquake Information Center (NEIC) provides real-time monitoring globally,...
The US National Seismic Hazard Model (NSHM) was updated in 2023 for all 50 states using new science on seismicity, fault ruptures, ground motions, and probabilistic techniques to produce a standard of practice public policy other engineering applications (defined return periods greater than ∼475 or less ∼10,000 years). Changes time-independent seismic hazard (both increases decreases compared previous NSHMs) are substantial because the model considers more data earthquake rupture forecasts...
Abstract The 2005 Mw 8.6 Nias–Simeulue earthquake was caused by rupture of a portion the Sunda megathrust offshore northern Sumatra. This event occurred within an array continuous Global Positioning System (gps) stations and produced measurable vertical displacement fringing coral reefs above fault rupture. Thus, this provides unique opportunity to assess source characteristics from joint analysis seismic data near-field static co-seismic displacements. Based on excitation normal mode...
Fossil coral microatolls from fringing reefs above the great (MW 8.6) megathrust rupture of 2005 record uplift during historically reported earthquake 1861. Such evidence spans nearly entire 400-km strike length rupture, which was previously shown to be bounded by two persistent barriers seismic rupture. Moreover, at sites where we have constrained 1861 amplitude, it is comparable in 2005. Thus and ruptures appear similar both extent magnitude. At one site an around AD 1422 also appears...
Photomosaics are commonly used to construct maps of paleoseismic trench exposures, but the conventional process manually using image‐editing software is time consuming and produces undesirable artifacts distortions. Herein, we document evaluate application image‐based modeling (IBM) for creating photomosaics 3D models illustrated with a case‐study across Wasatch fault in Alpine, Utah. Our results include structure‐from‐motion workflow semiautomated creation seamless, high‐resolution designed...
ABSTRACT We present the 2023 U.S. Geological Survey time-independent earthquake rupture forecast for conterminous United States, which gives authoritative estimates of magnitude, location, and time-averaged frequency potentially damaging earthquakes throughout region. In addition to updating virtually all model components, a major focus has been provide better representation epistemic uncertainties. For example, we have improved multifault ruptures, both in terms allowing more less fault...
Abstract The 6 February 2023 Kahramanmaraş, Turkey (Türkiye), earthquake sequence produced > 500 km of surface rupture primarily on the left-lateral East Anatolian (~345 km) and Çardak (~175 faults. Constraining length magnitude displacement causative faults is critical for loss estimates, recovery efforts, rapid identification impacted infrastructure, fault hazard analysis. To support these we rapidly mapped from satellite data with remote sensing field teams, released results to...
Coral records of relative sea level change provide a history vertical interseismic and coseismic deformation along the coast northern Simeulue Island, Sumatra, reveal details about earthquakes in 10th 14th–15th centuries A.D. southern end December 2004 M w 9.2 Sunda megathrust rupture. Over 56 year period between 1390 1455, experienced cluster ruptures, associated with total uplift that was considerably more than 2004. Uplifted corals at two sites constrain first event to 1393 ± 3 1394 2 (2...
Two isoproteins of calf liver metallothionein (MT) have been isolated, purified, and characterized by atomic absorption, ultraviolet electron spin resonance, 113Cd nuclear magnetic resonance spectroscopy. Native MT was found to contain both Cu+ Zn2+ in a mole ratio approximately 0.75. Selective replacement the native with 113Cd2+ can be accomplished vitro adding 113CdCl2 homogenate before chromatography. Both thus prepared 3.9 g atoms Cd2+ 2.6 Cu+/mol protein. No ESR signal found, indicating...
To gain insight into the longevity of subduction zone segmentation, we use coral microatolls to examine an 1100‐year record large earthquakes across boundary great 2004 and 2005 Sunda megathrust ruptures. Simeulue, a 100‐km‐long island off west coast northern Sumatra, Indonesia, straddles this boundary: Simeulue was uplifted in earthquake, whereas southern rose 2005. Northern corals reveal that predecessors earthquake occurred 10th century AD, AD 1394 ± 2, 1450 3. Corals from indicate none...
Earthquake response and related information products are important for placing recent seismic events into context particularly understanding the impact earthquakes can have on regional community its infrastructure. These tools even more useful if they available quickly, ahead of detailed from areas affected by such earthquakes. Here we provide an overview activities generated provided U.S. Geological Survey National Information Center in association with 2015 M 7.8 Gorkha, Nepal,...
Research Article| July 01, 2011 88 Hours: The U.S. Geological Survey National Earthquake Information Center Response to the 11 March Mw 9.0 Tohoku Gavin P. Hayes; Hayes Golden, Colorado 80401 U.S.A ghayes@usgs.gov (G. H.) 1U.S. Center, Colorado, U.S.A. 2Synergetics Inc., Fort Collins, Search for other works by this author on: GSW Google Scholar USGS/NEIC Team; Team Paul S. Earle; Earle Harley M. Benz; Benz David J. Wald; Wald Richard W. Briggs; Briggs Seismological Letters (2011) 82 (4):...
First posted January 11, 2017 For additional information, contact: Director, Geologic Hazards Science CenterU.S. Geological SurveyBox 25046, MS 966Denver, CO 80225-0046https://geohazards.usgs.gov/ This paper describes the tectonic summaries for all magnitude 7 and larger earthquakes in period 2000–2015, as produced by U.S. Survey National Earthquake Information Center during their routine response operations to global earthquakes. The goal of such is provide important event-specific...
We report stratigraphic evidence of land-level change and tsunami inundation along the Alaska-Aleutian megathrust during prehistoric historical earthquakes west Kodiak Island. On Sitkinak Island, cores tidal outcrops fringing a lagoon reveal five sharp lithologic contacts that record coseismic change. Radiocarbon dates, 137Cs profiles, computerized tomography scans, microfossil assemblages are consistent with rapid uplift circa 290–0, 520–300, 1050–790 cal yr B.P. subsidence in A.D. 1964...
Abstract Great subduction earthquakes are thought to rupture portions of the megathrust, where interseismic coupling is high and velocity‐weakening frictional behavior dominant, releasing elastic deformation accrued over a seismic cycle. Conversely, postseismic afterslip assumed occur primarily in regions velocity‐strengthening characteristics that may correlate with lower coupling. However, it remains unclear if fixed properties interface, coseismic or aftershock‐induced stress...
Abstract Slip distribution, slip rate, and per event for strike‐slip faults are commonly determined by correlating offset stream channels—under the assumption that they record seismic slip—but channels formed interplay of tectonic geomorphic processes. To constrain channel development under known conditions, we use numerical landscape evolution simulations along a theoretical fault with uniform steady uplift, erosion, diffusion. We investigate influence four parameters (fault zone width,...