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Okal 1996
Okal, E.A. (1996). Radial modes from the great 1994 Bolivian earthquake: No evidence for an isotropic component to the source. Geophysical Research Letters 23: doi: 10.1029/96GL00375. issn: 0094-8276.

We investigate a possible isotropic component in the source of the Bolivian earthquake of 09 June 1994 through a study of the radial modes pS0 (p=0,1) excited by the event. Our study departs from previous similar attempts by making use of a time series of sufficient duration (over 116 days) to sample the shape of the spectral line of the fundamental radial mode 0S0, and by combining measurements of two, radial modes, thereby lifting the trade-off between deviatoric and isotropic sources of excitation. Our result (an isotropic component of 0.5¿1.3% of the main double-couple) fails to identify a significant change in volume in the source of this, the largest deep earthquake ever recorded. ¿ American Geophysical Union 1996

BACKGROUND DATA FILES

Abstract

Keywords
Seismology, Surface waves and free oscillations, Seismology, Earthquake parameters, Information Related to Geographic Region, South America
Journal
Geophysical Research Letters
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Publisher
American Geophysical Union
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