OSMS 80-11.1

"Strong-Motion Records Recovered from the Trinidad-Offshore, California Earthquake of 8 November 1980"

by Richard D. McJunkin and Charles D. Turpen

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Introduction

The M_L=7.0 (University California Berkeley Seismographic Station) Trinidad-offshore earthquake occurred in the ocean approximately 72 km west-northwest of Eureka, California at 0227 Pacific Standard Time (PST) on 8 November 1980. The earthquake epicenter is located at approximately latitude 41.l°N and 125.4°W by using arrival times from sensitive seismographs owned by the University California Berkeley and Pacific Gas and Electric Company and strong-motion accelerographs owned by the California Division of Mines and Geology (CDMG), Office of Strong-Motion Studies (OSMS).
Nine CDMG-OSMS accelerograph stations were triggered and recorded the 8 November 1980 earthquake (Figure 1, Table 1). Six of these stations recorded peak ground accelerations that were 0.05 g or greater which is determined by CDMG to be significant.

All CDMG-OSMS accelerograms recording the Trinidad-offshore earthquake are presented. Maximum acceleration and respective peak with the azimuth or structural reference orientation that generates upward (positive) trace movement are noted on each significant earthquake record.