Summary of CSMIP Strong-Motion Records for the August 17, 1991 Earthquake near Petrolia, California

OSMS 91-09

by CSMIP Staff

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Accelerograms of particular interest which were recorded at CSMIP stations during the earthquake near Petrolia of August 17 are attached. Eleven accelerograms were recovered at nine stations including two buildings, one bridge and six freefield stations. The stations are located 11 to 71 km from the preliminary epicenter of 40.235°N and 124.348°W (UCB). The preliminary magnitude estimate is 6.0 ML (UCB).

The location of CSMIP stations and the earthquake epicenter are shown on the attached map. Peak accelerations for all records recovered, the station coordinates and distance from the epicenter are listed in Table 1.

Accelerograms of particular interest included here are:


- Petrolia. Closest station at 11 km, 53% g peak acceleration.


- Cape Mendocino. This station is 2 km more distant from the epicenter but the peak acceleration of 26% g is about one-half the value at Petrolia.


- Shelter Cove. Peak acceleration of 24% g at 33 km.