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Time-domain attenuation measurements for fundamental spheroidal modes (₀S₆ to ₀S₂₈) for the 1977 Indonesian earthquake

DEPARTMENT OF GEOPHYSICS STANFORD UNIVERSITY, STANFORD, CALIFORNIA 94305

Abstract

Using ultra-long period records of the 1977 Indonesian earthquake from seven IDA stations, we have measured the attenuation of fundamental spheroidal modes from ₀S₆ to ₀S₂₈. We determine the attenuation of each mode using a time domain technique which minimizes the effects of noise on the measurements. These measurements are the first attenuation data for these modes from multiple ultra-long period records of a single earthquake. Our results are in good general agreement with single station attenuation measurements from the UCLA gravimeter records of the Alaskan earthquake. They show systematically lower Q^–1(less attenuation) than results from stacking WWSSN records.

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