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Source mechanisms of twenty-six large, shallow earthquakes (M (sub s) > or = 6.5) during 1980 from P-wave first motion and long-period Rayleigh wave data



Source mechanisms of twenty-six large, shallow earthquakes (M (sub s) > or = 6.5) during 1980 from P-wave first motion and long-period Rayleigh wave data



Bulletin of the Seismological Society of America 74(3): 805-818



Source mechanisms 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. Constrained linear moment tensor inversion (M (sub xz) = M (sub yz) = 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 degrees . 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.--Modified journal abstract.

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