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Bulletin of the Seismological Society of America; June 1977; v. 67; no. 3; p. 651-660
© 1977 Seismological Society of America
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Split free oscillation amplitudes for the 1960 Chilean and 1964 Alaskan earthquakes

ROBERT J. GELLER and SETH STEIN

SEISMOLOGICAL LABORATORY CALIFORNIA INSTITUTE OF TECHNOLOGY, PASADENA, CALIFORNIA 91125
DIVISION OF GEOLOGICAL AND PLANETARY SCIENCES

Abstract

Splitting of the Earth's normal modes was observed for both the 1960 Chilean and 1964 Alaskan earthquakes. The strong peaks in the observed spectrum of each split multiplet correspond to singlets with much higher amplitudes than the others. Using theoretical results we have derived elsewhere (Stein and Geller, 1977a), we are able to predict this pattern. We show that the source mechanisms inferred for these earthquakes from surface waves are consistent with the observed pattern of relative spectral amplitudes of the split modes. However other mechanisms, such as a slow isotropic volume change, are also consistent with the split-mode amplitudes and are excluded only by additional data.




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Attenuation measurements of split normal modes for the 1960 Chilean and 1964 Alaskan earthquakes
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Time-domain observation and synthesis of split spheroidal and torsional free oscillations of the 1960 chilean earthquake: Preliminary results
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