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Determination of source parameters of small earthquakes from P-wave rise time^*

U.S. GEOLOGICAL SURVEY, MENLO PARK, CALIFORNIA 94025

Abstract

A simple method of estimating source dimensions and stress drops of small earthquakes is presented. The basic measurement is the time from the first break to the first zero crossing on short-period seismograms. Graphs relating these measurements to rise time as a function of Q and instrument response permit an estimate of earthquake source parameters without the calculation of spectra. Tests on data from Rangely, Colorado, and Hollister, California, indicate that the method gives reasonable results.

Footnotes

^* Publication authorized by the Director, U.S. Geological Survey.

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