Higher-mode Rayleigh waves studied as individual seismic phases

Emile A. Okal

doi:10.1016/0012-821X(79)90164-X

Higher-mode Rayleigh waves studied as individual seismic phases

Emile A. Okal^*

^*Corresponding author for this work

Earth and Planetary Sciences

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

We study a set of very high-quality records of first-order overtone Rayleigh waves from the deep-focus earthquake of September 29, 1973, in the Japan Sea. Standard surface wave techniques are used with these overtones, treated as individual seismic phases, to retrieve radiation pattern, Q, moment and phase velocity. A figure of M₀ = (6.7 ± 1.4) × 10²⁷ dyn-cm is obtained, in total agreement with published values computed from either P waves, or fundamental Rayleigh waves. We also demonstrate the feasibility of using overtones as individual seismic phases in order to investigate their dispersion and attenuation properties.

Original language	English (US)
Pages (from-to)	162-167
Number of pages	6
Journal	Earth and Planetary Science Letters
Volume	43
Issue number	1
DOIs	https://doi.org/10.1016/0012-821X(79)90164-X
State	Published - Jan 1 1979

ASJC Scopus subject areas

Geophysics
Geochemistry and Petrology
Earth and Planetary Sciences (miscellaneous)
Space and Planetary Science

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10.1016/0012-821X(79)90164-X

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AB - We study a set of very high-quality records of first-order overtone Rayleigh waves from the deep-focus earthquake of September 29, 1973, in the Japan Sea. Standard surface wave techniques are used with these overtones, treated as individual seismic phases, to retrieve radiation pattern, Q, moment and phase velocity. A figure of M0 = (6.7 ± 1.4) × 1027 dyn-cm is obtained, in total agreement with published values computed from either P waves, or fundamental Rayleigh waves. We also demonstrate the feasibility of using overtones as individual seismic phases in order to investigate their dispersion and attenuation properties.

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