Earthquakes
Earthquakes
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Tsunami Record from the Great 1906 San Francisco Earthquake
Shortly after the Great San Francisco earthquake of April 18, 1906, a sea level disturbance (tsunami) was recorded at the Presidio tide gauge station in San Francisco (the station is now located nearby at Ft. Point). What type of mechanism (earthquake rupture, landslide, other) generated the tsunami recorded at the Presidio tide gauge station?
Tsunami Field Studies
Our tsunami scientists work on international teams to study the aftermath of tsunamis around the world, to gain a better understanding the impact of potential tsunamis on coastal communities of the United States. Their work helps inform local, state, and federal coastal planning, protection, and resiliency.
Earthquake Data
Selected geophysical data for research. Products derived from these data are also available on the Products webpage.
Update of the Hawaii Seismic Hazard Model Workshop #1
Wednesday, September 18, 2019Honolulu, HIUniversity of Hawaii at Manoa
2018 United States (Lower 48) Seismic Hazard Long-term Model
The 2018 Update of the U.S. National Seismic Hazard Model defines the potential for earthquake ground shaking for various probability levels across the conterminous United States 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 available science in earthquake hazards...
Alaska
Probabilistic seismic hazard maps have been prepared for Alaska portraying ground motion values (peak ground acceleration and spectral amplitude at periods of 0.2, 0.3 and 1.0 seconds) at probabilities of exceedance of 2% and 10% in 50 years. Preparation of these maps followed the same general strategy as that followed for the U.S.G.S. seismic hazard maps of the contiguous United States, combining...
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.
Vs30 Models and Data
The following resources are available for Vs30 (the time-averaged shear-wave velocity to 30 m depth) models and data.
Foreign Hazard Maps
Hazard model studies for selected outside-the-U.S. locations.
Memphis Earthquake Hazard Mapping Project
Memphis has a dense urban population near faults capable of producing major earthquakes.
Central U.S. Seismic Velocity Model
Compared to what we know about earthquake hazards in California, less is known in the Central US.