Earthquakes
Earthquakes
Giant earthquakes occur on giant "megathrust" faults, which comprise the stuck portions of the interface between two converging tectonic plates. Other more frequent smaller earthquakes also occur elsewhere, within the down-going plate or the crust of the upper plate.
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2023 50-State Long-term National Seismic Hazard Model
The 2023 50-State Update of the U.S. National Seismic Hazard Model (NSHM) defines the potential for earthquake ground shaking for various probability levels across the conterminous United States, Alaska, and Hawaii and is applied in seismic provisions of building codes, insurance rate structures, risk assessments, and other public policy. The updated model represents an assessment of the best...
Cascadia Subduction Zone Marine Geohazards
Societal Issue: Uncertainty related to rupture extent, slip distribution, and recurrence of past subduction megathrust earthquakes in the Pacific Northwest (northern CA, OR, WA, and southern BC) leads to ambiguity in earthquake and tsunami hazard assessments and hinders our ability to prepare for future events.
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Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center, 3-D CT Core Imaging Laboratory, Core Preparation and Analysis Laboratory and Sample Repositories, Multi-Sensor Core Logger Laboratory, Deep Sea Exploration, Mapping and Characterization, Subduction Zone Science
Probabilistic Forecasting of Earthquakes, Tsunamis, and Earthquake Effects in the Coastal Zone
The nation's coastlines are vulnerable to the interrelated hazards posed by earthquakes, landslides, and tsunamis. In the marine environment these events often occur in concert, and distant triggers can cause severe local effects, making the issue global in scope. As the population continues to migrate toward the coastlines, the social impacts of these hazards are expected to grow.
Coastal and Marine Geohazards of the U.S. West Coast and Alaska
Coastal and marine geohazards are sudden and extreme events beneath the ocean that threaten coastal populations. Such underwater hazards include earthquakes, volcanic eruptions, landslides, and tsunamis.
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Natural Hazards Mission Area, Coastal and Marine Hazards and Resources Program, Pacific Coastal and Marine Science Center, 3-D CT Core Imaging Laboratory, Core Preparation and Analysis Laboratory and Sample Repositories, Big Sur Landslides, Deep Sea Exploration, Mapping and Characterization, Subduction Zone Science
SLAB2 - A Comprehensive Subduction Zone Geometry Model
Data for subduction zone slab geometry.
Landslides Triggered by the 2020 Puerto Rico Earthquake Sequence
A magnitude 6.4 earthquake occurred near Barrio Indios, Guayanilla, Puerto Rico on January 7, 2020. A study of the triggered landslides is ongoing.
Tsunami and Earthquake Research
Here you will find general information on the science behind tsunami generation, computer animations of tsunamis, and summaries of past field studies.
U.S. Seismic Hazard Maps – Puerto Rico and the U.S. Virgin Islands, Samoa and the Pacific Islands, and Guam and Northern Mariana Islands
Seismic hazard maps for Puerto Rico and the U.S. Virgin Islands, Samoa and the Pacific Islands, and Guam.
Caribbean Tsunami and Earthquake Hazards
Four million U.S. citizens live along the coastlines of Puerto Rico and the U.S. Virgin Islands, an earthquake- and tsunami-prone active tectonic plate boundary. A tsunami generated at the subduction zone boundary offshore Puerto Rico could also affect the U.S. Atlantic coast.
Preliminary Analysis of the April 2007 Solomon Islands Tsunami, Southwest Pacific Ocean
Information focused on geologic aspects of the April 2007 disaster.