Skip to main content
U.S. flag

An official website of the United States government

San Francisco Bay region 3D seismic velocity model v21.1

December 9, 2021

This three-dimensional (3D) seismic velocity model includes a detailed domain covering the greater San Francisco Bay urban region and a regional domain at a coarser resolution covering a larger region. Version 21.1 updates only the detailed domain with adjustments to the elastic properties east and north of the San Francisco Bay. There are no changes to the underlying 3D geologic model or the regional domain seismic velocity model. Version 21.1 of the detailed domain fits seamlessly inside version 21.0 of the regional domain without any jumps in elastic properties across the boundary between the two domains. The model was constructed by assigning elastic properties (density, Vp, Vs, Qp, and Qs) to grids of points based on the geologic unit and depth from the ground surface. The model is stored in HDF5 files using the GeoModelGrids ( storage scheme. GeoModelGrids provides a high-level interface for accessing the model. The model can also be accessed using the HDF5 application programming interface provided with many programming languages and tools, but the user will be responsible for all coordinate transformations.

Publication Year 2021
Title San Francisco Bay region 3D seismic velocity model v21.1
DOI 10.5066/P9TRDCHE
Authors Brad T Aagaard, Evan T Hirakawa
Product Type Data Release
Record Source USGS Digital Object Identifier Catalog
USGS Organization Earthquake Hazards Program