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Application of numerical method for S -wave focal mechanism determinations to earthquakes of Kamchatka-Kurile Islands Region

1964; Seismological Society of America; Volume: 54; Issue: 6A Linguagem: Inglês

10.1785/bssa05406a2049

1943-3573

Agustín Udías, William Stauder,

Geophysics and Sensor Technology

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.