Table 1

Seismic‐Velocity Models Registered into the Unified Community Velocity Model (UCVM) and Accessible through Its Standard Interface

Model Name, Version, and ReferenceModel DescriptionCoverage CoordinatesUCVM Abbreviations
SCEC CVM‐H, v.15.1 (Süss and Shaw, 2003; Shaw et al., 2015)Southern California 3D velocity model defined on regular mesh without a GTL that uses query by elevation developed by SCEC and Harvard Structural Geology groups−120.8620, 30.9565; −113.3329, 30.9565; −113.3329, 36.6129; −120.8620, 36.6129cvmh
SCEC CVM‐S4 (Kohler et al., 2003)Southern California 3D velocity model defined as rule‐based system with a GTL that uses query by depth developed by SCEC, Caltech, and USGS groupsIrregular areacvms
SCEC CVM‐S4.26 (Lee, Chen, Jordan, et al., 2014)Southern California 3D velocity model defined on regular mesh without a GTL that uses query by depth based on CVM‐S4 as starting model improved using full 3D tomography−116.0000, 30.4499; −122.3000, 34.7835; −118.9475, 38.3035; −112.5182, 33.7819cvms5
SCEC CVM‐S4.26.M01 (Lee, Chen, Jordan, et al., 2014)Southern California 3D velocity model defined on regular mesh with query by depth that adds a GTL to CVM‐S4.26Same as CVM‐S4.26cvmsi
USGS Bay Area Model, Hi‐res and Lo‐res etree v.08.3.0 (Brocher et al., 2006)San Francisco Bay Area and central California 3D velocity model defined on regular mesh with a GTL that uses query by depth−126.3532, 39.6806; −123.2732, 41.4849; −118.9445, 36.7022; −121.9309, 35.0090cencal
Modified Hadley–Kanamori 1D (Hauksson, 2010)Southern California region 1D velocity model in nine layers with query by depth that defines VP and scaling relationship to calculate VS and density valuesArbitrary region1d
Northridge region 1D model (Graves and Pitarka, 2010)Northridge region 1D velocity model defined in 18 layers with query by depth that was derived from velocity profiles at SCSN stationsArbitrary regionbbp1d
Topography and VS30 model (Gesch et al., 2002; Wills and Clahan, 2006; Wald and Allen, 2007)Digital elevation model for California with VS30 values based on site classification or topography VS30 relationship−129.7500, 40.7500; −121.0950, 45.7772; −109.9633, 32.0737; −117.8794, 27.8247ucvm

CVM‐H, Community Velocity Model ‐ Harvard; SCEC, Southern California Earthquake Center; SCSN, Southern California Seismic Network; USGS, U.S. Geological Survey.