Peak values of processed data v CHARACTERISTICS OF THE COYOTE LAKE EARTHQUAKE The following information is based on the preliminary report by Lee and others (1979), describing the August 6 Coyote Lake earthquake and its major aftershocks. The earthquake was of moderate size, magnitude 5.7+0.2, predominantly right-lateral strike-slip, with an origin time of August 6, 1979, I7h05m22.3+0.1s (UTC). The epicenter was located at 27°6.7'N and 121°32.0'W, (+1 km), with an approximate focal depth of 9.6 km. The calculated location of the epicenter is about 1 km to the east of the Calaveras fault trace in the vicinity of Coyote Lake, about 10 km NNE of Gilroy (Figure 1). From calculated aftershock locations it has been estimated that faulting during the main shock extended 20 km to the southeast of the epicenter along the Calaveras fault at depths of between 4 and 12 km. No evidence of significant surface faulting has been found. Uhrhammer (1980) reports on the major seismological data obtained from the Seismographic Station network of the University of California at Berkeley:
This paper discusses the effect of soil structure interaction on seismoqrams. In particular, seismograms of the 1979 Imperial Valley earthquake, taken from two instruments located close together, are discussed. One of these instruments is down hole and the other one is housed inside the recorder structure. It is shown that soil structure interaction theory accounts well for the differences in the measured vertical accelerations but not so well for the horizontal accelerations.
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