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On the selection of station sites for observing strain steps and earthquake forerunners in California

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION GODDARD SPACE FLIGHT CENTER, CODE 921, GREENBELT, MARYLAND 20771
SYSTEMS AND APPLIED SCIENCES CORPORATION, RIVERDALE, MARYLAND 20840

Abstract

Based on seismic data in the period 1931 to 1960 in California and western Nevada, we have calculated probabilities for observing strain steps in 10 years at 729 hypothetical stations covering from 30°N to 43°N and 114°W to 127°W. As an independent test on the results, we have computed the number of strain steps which would have been detected at each station during the period between 1961 to 1970. Using the statistical method of detecting unusual seismic activities developed by Shimazaki, it has been found that the most favorable locations for observing crustal deformation in California are in the vicinity of Monterey and in the area surrounding San Bernardino.