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

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 (https://geomodelgrids.readthedocs.io) 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.

Data and Resources

Field Value
accessLevel public
bureauCode {010:12}
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_@id https://ddi.doi.gov/usgs-data.json
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
identifier http://datainventory.doi.gov/id/dataset/usgs-61817394d34e9f2789e3c36c
metadata_type geospatial
modified 2021-12-08T00:00:00Z
old-spatial -126.3216, 35.0364, -118.9787, 41.4586
publisher U.S. Geological Survey
resource-type Dataset
source_datajson_identifier true
source_hash 7bf96ea933c9f3a624791e543bfb79cc94246feb5d3fafe95ee7b28c83858358
source_schema_version 1.1
spatial {"type": "Polygon", "coordinates": [[[-126.3216, 35.0364], [-126.3216, 41.4586], [ -118.9787, 41.4586], [ -118.9787, 35.0364], [-126.3216, 35.0364]]]}
theme {geospatial}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • AmeriGEO
  • AmeriGEOSS
  • CKAN
  • GEO
  • GEOSS
  • National
  • North America
  • United States
  • california
  • earthquake
  • earthquake-hazards
  • elastic-properties
  • epicenter
  • ghsc
  • golden
  • plate-tectonics
  • san-francisco-bay
  • seismic
  • seismic-velocity-model
  • three-dimensional-model
  • usgs
  • usgs-61817394d34e9f2789e3c36c
isopen False
license_id notspecified
license_title License not specified
maintainer Brad T Aagaard
maintainer_email baagaard@usgs.gov
metadata_created 2025-09-23T18:30:26.851687
metadata_modified 2025-09-23T18:30:26.851694
notes 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 (https://geomodelgrids.readthedocs.io) 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.
num_resources 2
num_tags 22
title San Francisco Bay region 3D seismic velocity model v21.1