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Bulletin of the Seismological Society of America; February 1993; v. 83; no. 1; p. 180-189
© 1993 Seismological Society of America
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An automatic S-phase picker

ARTUR CICHOWICZ

UNIVERSITY OF THE WITWATERSRAND BERNARD PRICE INSTITUTE OF GEOPHYSIC RESEARCH, PRIVATE BAG 3, WITS 2050, JOHANNESBURG, South Africa

Abstract

An algorithm has been developed for the automatic picking of the S phase from three-component seismic data. Three parameters of the signal are calculated in the program: deflection angle, degree of polarization, and the ratio between transverse energy and total energy. The S phase is declared when the product of the three parameters increases above the reference level. Most parameters are computed automatically and modified if necessary. The S-phase picker is used to analyze data from a local underground mine seismic network.




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