Geotechnical Data from Accelerograph Stations Investigated during the Period 1975-1979: Fid-Bau Portal

Geotechnical Data from Accelerograph Stations Investigated during the Period 1975-1979

This report summarizes geotechnical data that was obtained in the investigation of 83 accelerograph stations located in the United States. These stations were studied during the period from 1975 to 1979 and the detailed findings are contained in nine data reports. Summary logs indicating subsurface soil conditions and material properties have been prepared for each of the accelerograph stations. A classification system was devised for grouping the stations as either rock sites, stiff soil sites or deep soil sites. Using this classification system, simple ground motion plots have been prepared which qualitatively indicate the dependency of earthquake motions on local site conditions. This classification system may be used in more elaborate and quantitative studies of the influence of local site conditions upon earthquake ground response. On a practical engineering level, the site classification system and the results of the individual site investigations may be used in selecting earthquake records to establish seismic design criteria. Further research of the subsurface conditions at additional accelerograph stations is needed to increase the data base of earthquake records and recording stations.