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Published April 1975 | Published
Journal Article Open

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


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 S̄_d(cm) ≈ 1/49.2(10^(0.288 I_MM)) for I_(MM) ≦ VIII and is characterized by one standard deviation of about 0.7 S̄_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 measurements, when other seismological instruments may go off scale.

Additional Information

Copyright © 1975, by the Seismological Society of America. Manuscript received September 30, 1974. We thank G. W. Housner, P. C. Jennings, J. E. Luco, and F. E. Udwadia for critical reading of the manuscript and for offering valuable suggestions. This research has been supported in part by the grants from the National Science Foundation and by the Earthquake Research Affiliates Program at the California Institute of Technology.

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