Surface Wave Measurements for Vs30 Reports

VS30 is the time-averaged shear-wave velocity in the upper thirty meters of the earth's surface. It is a key index adopted by the earthquake engineering community to account for seismic site conditions. VS30 is also used by the National Earthquake Hazards Reduction Program and the Uniform Building Code to separate sites into classes for earthquake engineering design. These reports contain the results of surface wave measurement studies conducted at various CSMIP station sites in California.

Report Title
Report Number
Surface Wave Measurements Report, Riverside County, California by GeoVision. September, 2016GeoVision 16192‑01 Rev2
Vs30 Site Characterization Report, Los Angeles, Orange, Ventura, San Bernadino, and Riverside Counties by Petralogix. June, 2017Petralogix 2017‑00006
Surface Wave Measurements, Santa Clara, Santa Cruz, San Benito, and Monterey Counties by GeoVision. June, 2018GeoVision 18045‑01


The reports posted at this website were developed from the contracts of the Strong Motion Instrumentation Program in the California Geological Survey of the California Department of Conservation. The reports have not been edited to the standards of a formal publication. Any opinions, findings, conclusions or recommendations contained in the reports are those of the authors, and should not be interpreted as representing the official policies, either expressed or implied, of the State of California. The material presented in these reports should not be used or relied upon for any specific application without competent examination and verification of its accuracy, suitability, and applicability by qualified professionals. Users of information from these publications assume all liability arising from such use.