Mapping NEHRP VS30 site classes
Earthquake Spectra
By: T.L. Holzer, A.C. Padovani, M.J. Bennett, T.E. Noce, and J. C. Tinsley III
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Abstract
Site-amplification potential in a 140-km2 area on the eastern shore of San Francisco Bay, California, was mapped with data from 210 seismic cone penetration test (SCPT) soundings. NEHRP VS30 values were computed on a 50-m grid by both taking into account the thickness and using mean values of locally measured shear-wave velocities of shallow geologic units. The resulting map of NEHRP VS30 site classes differs from other published maps that (1) do not include unit thickness and (2) are based on regional compilations of velocity. Although much of the area in the new map is now classified as NEHRP Site Class D, the velocities of the geologic deposits within this area are either near the upper or lower VS30 boundary of Class D. If maps of NEHRP site classes are to be based on geologic maps, velocity distributions of geologic units may need to be considered in the definition of VS30 boundaries of NEHRP site classes. ?? 2005, Earthquake Engineering Research Institute.
Suggested Citation
Holzer, T., Padovani, A., Bennett, M., Noce, T., and Tinsley, J.C., 2005, Mapping NEHRP VS30 site classes: Earthquake Spectra, v. 21, no. 2, p. 353-370, https://doi.org/10.1193/1.1895726.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Mapping NEHRP VS30 site classes |
| Series title | Earthquake Spectra |
| DOI | 10.1193/1.1895726 |
| Volume | 21 |
| Issue | 2 |
| Publication Date | May 01, 2005 |
| Year Published | 2005 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Earthquake Spectra |
| First page | 353 |
| Last page | 370 |