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On correlation of seismoscope response with earthquake magnitude and Modified Mercalli Intensity

EARTHQUAKE ENGINEERING RESEARCH LABORATORY CALIFORNIA INSTITUTE OF TECHNOLOGY, PASADENA, CALIFORNIA 91109

Abstract

A quantitative measure of the Modified Mercalli Intensity Scale for earthquakes in the western United States has been developed by correlating the peak seismoscope relative displacement response, S_d, with the reported site intensity, I_MM. This correlation can be approximated by

for I_MM VIII and is characterized by one standard deviation of about 0.7 _d. The data used in this study do not indicate an obvious type of dependence of S_d on local site conditions.

A method for computing the analog of the local earthquake magnitude, M_seismoscope, has been presented for possible use in strong-motion seismology and for scaling earthquakes by close-in measuremients, when other seismological instruments may go off scale.

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