Characteristics of Near-Surface S-wave Velocity

Characteristics of Near-Surface S-wave Velocity

so-called Vs30, for example, is a critical simplified parameter in engineering to illustrate seismic site effect. This study was based on the Engineering Geological Database for TSMIP(EGDT), which is being undertaken by the National Center for Research on Earthquake Engineering(NCREE) and the Central Weather Bureau(CWB) in Taiwan since 2000. EGDT contains 469 surveyed stations so far, the number is about 69%(469/682) of the free-field TSMIP network. We therefore used the database to evaluate empirical S-wave velocity(Vs) equations for different regions by relating Vs to depth and N-value, and the site categories of drilled strong motion stations were classified according to the Vs30 criterion of Building Seismic Safety Council(BSSC). In addition, researchers and engineers in related fields can search their stations of interest and apply for the data on the website: http://egdt.ncree.org.tw/.