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Earthquake Hazards

The USGS monitors and reports on earthquakes, assesses earthquake impacts and hazards, and conducts targeted research on the causes and effects of earthquakes. Explore and search below.

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M6.4 March 10, 1933 Long Beach, California Earthquake

The magnitude 6.4 Long Beach, California earthquake, which struck near 5pm local time on March 10, 1933, was a landmark event. It was the largest known earthquake in the Los Angeles region at the time, since the advent of written record-keeping. It occurred at a pivotal point historically, during an active debate about seismic hazard in the area.
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M6.4 March 10, 1933 Long Beach, California Earthquake

The magnitude 6.4 Long Beach, California earthquake, which struck near 5pm local time on March 10, 1933, was a landmark event. It was the largest known earthquake in the Los Angeles region at the time, since the advent of written record-keeping. It occurred at a pivotal point historically, during an active debate about seismic hazard in the area.
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Earthquake Geology and Paleoseismology Overview

The goals of USGS earthquake geology and paleoseismology research are 1) to make primary observations and develop ideas to improve our understanding of the geologic expression of active faulting, and 2) to acquire data that will improve the National Seismic Hazard Model. Geological research allows us to characterize faults, including the identification of secondary seismogenic structures, to study...
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Earthquake Geology and Paleoseismology Overview

The goals of USGS earthquake geology and paleoseismology research are 1) to make primary observations and develop ideas to improve our understanding of the geologic expression of active faulting, and 2) to acquire data that will improve the National Seismic Hazard Model. Geological research allows us to characterize faults, including the identification of secondary seismogenic structures, to study...
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Earthquake Processes, Probabilities, and Occurrence

The overarching theme of this project is to discover as much as we can about earthquakes and faulting from field and laboratory observations and to combine this with geophysical, geological, geochemical, and mathematical (including computational) modeling of earthquake sources and fault zones so as to best improve probabilistic USGS Earthquake Hazard Assessments. This project also investigates...
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Earthquake Processes, Probabilities, and Occurrence

The overarching theme of this project is to discover as much as we can about earthquakes and faulting from field and laboratory observations and to combine this with geophysical, geological, geochemical, and mathematical (including computational) modeling of earthquake sources and fault zones so as to best improve probabilistic USGS Earthquake Hazard Assessments. This project also investigates...
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Ground Motion

The overall objective of this research is to improve the understanding of the damaging ground motions produced in earthquakes in order to develop better methods for seismic hazard assessment and mitigation in urban areas. The overall objective of this research is to improve the understanding of the damaging ground motions produced in earthquakes in order to develop better methods for seismic...
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Ground Motion

The overall objective of this research is to improve the understanding of the damaging ground motions produced in earthquakes in order to develop better methods for seismic hazard assessment and mitigation in urban areas. The overall objective of this research is to improve the understanding of the damaging ground motions produced in earthquakes in order to develop better methods for seismic...
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Southern California Earthquake Hazards

Southern California has the highest level of earthquake risk in the United States, with half of the expected financial losses from earthquakes in the Nation expected to occur in southern California. Sitting astride the Pacific - North American plate boundary at the Big Bend of the San Andreas Fault, Southern California has over 300 faults capable of producing magnitude 6 and larger earthquakes...
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Southern California Earthquake Hazards

Southern California has the highest level of earthquake risk in the United States, with half of the expected financial losses from earthquakes in the Nation expected to occur in southern California. Sitting astride the Pacific - North American plate boundary at the Big Bend of the San Andreas Fault, Southern California has over 300 faults capable of producing magnitude 6 and larger earthquakes...
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M7.3 June 28, 1992 Landers Earthquake

“The Landers earthquake, which had a moment magnitude (Mw) of 7.3, was the largest earthquake to strike the contiguous United States in 40 years. This earthquake resulted from the rupture of five major and many minor right-lateral faults near the southern end of the eastern California shear zone.” —Kerry Sieh et al., Science, v 260, issue 5105, 171-176.
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M7.3 June 28, 1992 Landers Earthquake

“The Landers earthquake, which had a moment magnitude (Mw) of 7.3, was the largest earthquake to strike the contiguous United States in 40 years. This earthquake resulted from the rupture of five major and many minor right-lateral faults near the southern end of the eastern California shear zone.” —Kerry Sieh et al., Science, v 260, issue 5105, 171-176.
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Request for Hazard Modeling Contributions

The U.S. Geological Survey (USGS) will publish an updated National Seismic Hazard Model (NSHM) in 2023 covering the conterminous U.S. (CONUS), Alaska, and Hawaii (50-State Update). The next update of the NSHM for Puerto Rico and the U.S. Virgin Islands (PRVI) will be in 2025.
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Request for Hazard Modeling Contributions

The U.S. Geological Survey (USGS) will publish an updated National Seismic Hazard Model (NSHM) in 2023 covering the conterminous U.S. (CONUS), Alaska, and Hawaii (50-State Update). The next update of the NSHM for Puerto Rico and the U.S. Virgin Islands (PRVI) will be in 2025.
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Earthquake Early Warning - Overview

USGS is actively pursuing research in earthquake early warning.
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Earthquake Early Warning - Overview

USGS is actively pursuing research in earthquake early warning.
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Introduction to the National Seismic Hazard Maps

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Information for PIs

Information for PIs.
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Thailand Seismic Hazard Workshop - 2007

The links in the following agendas are to PDF files of participants that have granted permission to view their presentations.
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Thailand Seismic Hazard Workshop - 2007

The links in the following agendas are to PDF files of participants that have granted permission to view their presentations.
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Workshop on Hazard from Induced Seismicity

The links in the following agendas are to PDF files of participants that have granted permission to view their presentations.
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Workshop on Hazard from Induced Seismicity

The links in the following agendas are to PDF files of participants that have granted permission to view their presentations.
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