Most of the VS30 data are for sites in the western contiguous United States (2,141 sites), whereas 786 Vs30 values are for sites in the Central and Eastern United States 70 values are for sites in other parts of the United States, including Alaska (15 sites), Hawaii (30 sites), and Puerto Rico (25 sites). Whenever possible, Vs30 originating from these earlier compilations were crosschecked against published reports.īoth downhole and surface-based Vs30 estimates are represented. A small subset (less than 20 percent) of Vs30 values was previously compiled by the USGS and other research institutions.
Most of the data originated from publications directly reporting the work of field investigators. Thus far, there are 2,997 sites in the United States, along with metadata for each measurement from government-sponsored reports, Web sites, and scientific and engineering journals. Geological Survey (USGS) and other governmental agencies. Grid resolution: 30 arc-seconds (0.0083333333 degrees)Ĭompiled Vs30 measurements obtained by studies funded by the U.S.Download geotiff and auxillary files for Global Vs30 Data (631 MB ZIP).Download GMT grd file for Global Vs30 Data (631 MB ZIP).
Download usgs map code#
Source code repository on Github (for technical users).Browse and download data through the Vs30 map app.The following resources are available for Vs30 (the time-averaged shear-wave velocity to 30 m depth) models and data.īased on topographic slope, with custom embedded maps (Heath et al., 2020).
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