A Compilation of Vs30 Values in the United States

Compiled Vs30 measurements obtained by studies funded by the U.S. Geological Survey (USGS) and other governmental agencies. 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. Most of the data originated from publications directly reporting the work of field investigators. A small subset (less than 20 percent) of Vs30 values was previously compiled by the USGS and other research institutions. Whenever possible, Vs30 originating from these earlier compilations were crosschecked against published reports. Both downhole and surface-based Vs30 estimates are represented. Most of the VS30 data...

Types: Citation; Tags: Earth, Earthquake Hazards Program, GHSC, Geologic Hazards Science Center, USGS, All tags... Vs30, Vs30 coefficients, average shear-velocity, earth science, earthquake hazard, emergency management, emergency manager, emergency responder, emergency response, first-order assessment of seismic site conditions, geology, geophysics, ground-motion prediction, ground-shaking, seismic hazard, seismic site conditions, seismology, shear-velocity, topographic slope, topographic slope-based Vs30 maps, topography, Fewer tags

Global Vs30 Map Server

The Global Vs30 Server allows a user to select from a map or input a rectangular region of interest. It then provides (optionally) a Vs30 grid in ASCII or GMT grid format, and a JPEG Vs30 map. Wald et al. (2004) first, and Wald and Allen (BSSA, 2007, in press), more fully, describe a methodology for deriving maps of seismic site conditions using topographic slope as a proxy. Vs30 measurements (the average shear-velocity down to 30 m) are correlated against topographic slope to develop two sets of coefficients for deriving Vs30: one for active tectonic regions that possess dynamic topographic relief, and one for stable continental regions where changes in topography are more subdued.

Types: Citation; Tags: Earth, Earthquake Hazards Program, GHSC, Geologic Hazards Science Center, USGS, All tags... USGS Science Data Catalog (SDC), Vs30, Vs30 coefficients, average shear-velocity, earth science, earthquake hazard, emergency management, emergency manager, emergency responder, emergency response, first-order assessment of seismic site conditions, geology, geophysics, ground-motion prediction, ground-shaking, seismic hazard, seismic site conditions, seismology, shear-velocity, topographic slope, topographic slope-based Vs30 maps, topography, Fewer tags