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Bulletin of the Seismological Society of America; June 1984; v. 74; no. 3; p. 805-818
© 1984 Seismological Society of America
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Source mechanisms of twenty-six large, shallow earthquake (MS greater double equals 6.5) during 1980 from P-wave first motion and long-period Rayleigh wave data

ICHIRO NAKANISHI* and HIROO KANAMORI

SEISMOLOGICAL LABORATORY CALIFORNIA INSTITUTE OF TECHNOLOGY, PASADENA, CALIFORNIA 91125

Abstract

Source mechanisms of 26 large shallow earthquakes are determined in terms of a double-couple point source with a correction for the nondirectional part of source finiteness by using P-wave first motions and long-period Rayleigh wave spectra recorded on WWSSN, IDA, and GDSN networks. The combined use of both data sets allows us to determine the double-couple mechanism uniquely in most cases. Constrained linear moment tensor inversion (Mxz = Myz = 0) correctly determines the strike of the fault, but fails to estimate the dip, and underestimates the scalar moment. All thrust events along the deep-sea trenches analyzed in this study show nodal planes which dip perpendicular to the trench axis at an angle shallower than 45°. The fit to data of the double-couple inversion is comparable to that of the constrained moment tensor inversion. Using the phase spectra of surface waves we can detect a slow source process with an accuracy of about 10 to 20 sec.

Footnotes

* Present address: Research Center for Earthquake Prediction, Faculty of Science, Hokkaido University, Sapporo 060, Japan.




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