Geologic logs from 25 boreholes near strong motion accelerographs that recorded the 1989 Loma Prieta, California, earthquake

Abstract

indicated on the log by "void").To maintain fluid pressure during geophysical logging, PVC pipe was placed from the surface to the bottom of the hole and then anchored with cement grouting from 1 to 25 feet and from 42 to 46 feet.Second, the Snow Park borehole was drilled in Snow Park, Oakland, which is two blocks away from the office building that contains the instrument.As the geology is fairly flat-lying around this site, the distance between the borehole and the instrument should not cause a problem for the analysis.