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Bulletin of the Seismological Society of America; December 1964; v. 54; no. 6A; p. 2049-2065
© 1964 Seismological Society of America
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Application of numerical method for S-wave focal mechanism determinations to earthquakes of Kamchatka-Kurile Islands Region

AGUSTIN UDIAS, S.J. and WILLIAM STAUDER, S.J.

ST. LOUIS UNIVERSITY INSTITUTE OF TECHNOLOGY, 3621 OLIVE ST., ST. LOUIS, MISSOURI

Abstract

The least squares method for the determination of focal mechanism using S-wave data developed by Udias (1964) has been applied to 34 earthquakes of the Kamchatka-Kurile Islands Regions. For most of the earthquakes studied the source mechanism was found to conform best to a double couple model. The accuracy and stability of the solutions are examined. The direction of the principal axes of stress for most of the solutions show a steeply dipping axis of tension and an almost horizontal axis of pressure. The orientation of the pressure axes is normal to the regional trend. The direction of the stresses suggest a thrust faulting with predominantly dip slip motions such that the continental block moves over the oceanic.




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