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by CSMIP
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Introduction
Accelerograms of particular interest recorded at CSMIP stations during the April 22
earthquake near Desert Hot Springs are attached. The earthquake occurred under the Little
San Bernardino Mountains about 17 km east of Desert Hot Springs and 22 km northeast of
Palm Springs. Caltech and the USGS have estimated the earthquake hypocenter to be at
33.96°N, 116.32°W, at 12 kilometers depth. They have estimated the magnitude as 6.1 ML.
From their seismic networks, they determined that the event
had a right-lateral strike-slip mechanism, on a vertical
fault striking N15°W several km east of the San Andreas
fault.
The map in Figure 1 shows the location of selected CSMIP stations from which records have
been recovered to date. Recovery of other records is underway. Table 1 lists the epicentral
distance for selected CSMIP stations in the area and, when available, preliminary peak
acceleration values.
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