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Bulletin of the Seismological Society of America; December 1971; v. 61; no. 6; p. 1827-1830
© 1971 Seismological Society of America
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A seismic discriminant based on focal mechanism

ATIQ A. SYED*, CARL KISSLINGER and OTTO W. NUTTLI

DEPARTMENT OF EARTH AND ATMOSPHERIC SCIENCES SAINT LOUIS UNIVERSITY, ST. LOUIS, MISSOURI 63156

Abstract

Utilizing the observation that a predominant focal mechanism exists for a given hypocentral region, a seismic discriminant based on body-wave magnitude has been developed. This discriminant enables one to identify earthquakes that do not fit mechanisms expected from plate tectonics. It also sorts out explosions as anomalies, even for those regions in which the focal mechanism results in compressional first motions at most or all available seismograph stations.

Footnotes

* Present address: Globe Universal Sciences International, Inc., Oran, Algeria.




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A. A. SYED and O. W. NUTTLI
A method of correcting P-wave magnitudes for the effect of earthquake focal mechanism
Bulletin of the Seismological Society of America, December 1, 1971; 61(6): 1811 - 1826.
[Abstract] [PDF]


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