Bulletin of the Seismological Society of America
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Bulletin of the Seismological Society of America; December 1978; v. 68; no. 6; p. 1595-1611
© 1978 Seismological Society of America
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Attenuation measurements of split normal modes for the 1960 Chilean and 1964 Alaskan earthquakes

SETH STEIN and ROBERT J. GELLER

DEPARTMENT OF GEOPHYSICS SCHOOL OF EARTH SCIENCES STANFORD UNIVERSITY, STANFORD, CALIFORNIA 94305
SEISMOLOGICAL LABORATORY CALIFORNIA INSTITUTE OF TECHNOLOGY, PASADENA, CALIFORNIA 91125

Abstract

Measurements of attenuation for the Earth's longest period modes can be significantly biased by the effects of frequency splitting. Using our previously developed methods of time domain synthesis of split normal modes, we measure Q without such a bias. We also conduct numerical experiments to confirm the errors in Q measurements which result from neglecting the effects of splitting. In contrast to frequency domain this time domain technique allows us to reject data below the ambient noise level for each mode. The Q's of the longest period spheroidal (0S2–0S5) and torsional (0T3–0T4) modes are determined using long (500 hr) records from the Chilean and Alaskan earthquakes.




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Analysis of split normal modes for the 1977 Indonesian earthquake
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R. J. GELLER and S. STEIN
Time-domain attenuation measurements for fundamental spheroidal modes (0S6 to 0S28) for the 1977 Indonesian earthquake
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