| 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. |
| Genre: | Article |
| ProdID: | 70029481 |
| Citation Author: | Holzer, T. L.; Padovani, A. C.; Bennett, M. J.; Noce, T. E.; Tinsley, III, J. C. |
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| Citation End Page: | 370 |
| Citation Issue: | 2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Earthquake Spectra |
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| Citation Number Of Pages: | 18 |
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| Citation Search Results Text: | Mapping NEHRP VS30 site classes; 2005; Article; Journal; Earthquake Spectra; Holzer, T. L.; Padovani, A. C.; Bennett, M. J.; Noce, T. E.; Tinsley, III, J. C. |
| Citation Start Page: | 353 |
| Citation Volume: | 21 |
| Citation Year: | 2005 |
| Type: | citation/reference |
| Text: | Mapping NEHRP VS30 site classes; 2005; Article; Journal; Earthquake Spectra; Holzer, T. L.; Padovani, A. C.; Bennett, M. J.; Noce, T. E.; Tinsley, III, J. C. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1193/1.1895726 |
| Date Other: | Sat, 1 Jan 2005 00:00 -0600 |
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