NEHRP Clearinghouse
- Title
- Shear Velocities and Near-Surface Geologies at Accelerograph Sites that Recorded the San Fernando Earthquake.
- File
- PB301164.pdf
- Author(s)
- Eguchi, R. T.; Campbell, K. W.; Duke, C. M.; Chow, A. W.; Paternina, J.
- Source
- National Science Foundation, Washington, DC. Engineering and Applied Science., June 1976, 65 p.
- Identifying Number(s)
- UCLA/ENG-7653
- Abstract
- This study seeks accurate near-surface shear-wave velocity data at several sites in the Los Angeles area. These data currently are being used to correlate both seismic velocity and strong-motion indices with local near-suface site conditions. Included is a compilation of refraction seismic survey and geotechnical data on thirty-three sites selected within the Los Angeles, California area. The sites were chosen on the basis of two criteria: (1) their relative closeness to strong motion accelerographs that recorded the 1971 San Fernando earthquake; and (2) their geologic representativeness. The main areas of concentration for thse surveys were Wilshire Boulevard, Downtown Los Angeles, and Pasadena. Using the refraction technique, shear wave velocities and layer thicknesses down to approximately 70 feet were determined. Geotechnical data on geology, age, lithology, and depth, from several sources, were compiled for each site. Also provided is a summary of new field techniques developed and applied during the study. Results for this work phase are included in Appendix A.
- Keywords
- Seismic waves; California; Geological surveys; Data acquisition; San Fernando earthquake; Earthquake engineering; Site surveys; Secondary waves; Earthquakes