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Filters Date Range Past year (0) Past month (0) Past week (0) Past day (0) Custom range... To   Search Extensions Raster (1) Types Downloadable (1) GeoTIFF (1) OGC WFS Layer (1) OGC WMS Layer (1) OGC WMS Service (1) Raster (1) Contacts Earthquake Hazards Program U.S. Geological Survey - ScienceBase Eric M Thompson Eric M. Thompson GHSC Data Steward More... Categories Data (1) Tag Types Theme (1) Place (1) Harvest Set (1) Tag Schemes USGS Thesaurus (1) None (1) View Results as: JSON ATOM CSV

An Updated Vs30 Map for California with Geologic and Topographic Constraints (ver. 2.0, July 2022) This data release provides a map of the time-averaged shear-wave velocity in the upper 30 m (Vs30) for California using the method described by Thompson and others (2014). There are two adjustments to the algorithm described by Thompson and others (2014), which is built on the geology-based Vs30 map by Wills and Clahan (2006). In this data release, we use the Wills and others (2015) updated geology-based Vs30 map. The second change is that we have adjusted the kriging procedure so that measured Vs30 values do not affect the predictions across distinctly different geologic units. July 2022 Update (ver. 2.0) Resolution is now 3 arcseconds instead of 7.5 arcseconds Fixed a code error that prevented some of the Vs30... Categories: Data, Data Release - Revised; Types: Downloadable, GeoTIFF, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Raster; Tags: California, Earthquake Hazards Program, GHSC, Geologic Hazards Science Center, USGS, All tags... USGS Science Data Catalog (SDC), United States, earth science, earthquake hazard, geophysics, seismic hazard, seismology, tectonic, Fewer tags