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INSTITUTE OF TECHNOLOGY SAINT LOUIS UNIVERSITY, SAINT LOUIS, MISSOURI
Abstract
The polarization of S waves at stations distributed azimuthally about the source is examined for each of twenty-three Kamchatka earthquakes of 1950-1960. In nineteen of these earthquakes the P and S wave data are in agreement with a double couple source as the point model of the focal mechanism. The S waves indicate a uniform mechanism which repeats itself from earthquake to earthquake and from which it may be inferred that the axes of greatest and least stress at the foci tend to lie in a vertical plane normal to the trend of the Kamchatka-Kuriles arc. The axis of least stress usually plunges almost vertically under the continent, but may also plunge less steeply, at angles as low as 45 degrees. At least two earthquakes may be represented by a single couple source.
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A. Udias, A. UDIAS, and W. STAUDER Application of numerical method for S-wave focal mechanism determinations to earthquakes of Kamchatka-Kurile Islands Region Bulletin of the Seismological Society of America, December 1, 1964; 54(6A): 2049 - 2065. [Abstract] [PDF]
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A. UDIAS A least squares method for earthquake mechanism determination using S-wave data Bulletin of the Seismological Society of America, December 1, 1964; 54(6A): 2037 - 2047. [Abstract] [PDF]
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K. KASAHARA Radiation mode of S waves from a deep-focus earthquake as derived from observations Bulletin of the Seismological Society of America, April 1, 1963; 53(3): 643 - 659. [Abstract] [PDF]
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W. STAUDER and A. UDIAS S-wave studies of earthquakes of the North Pacific, Part II: Aleutian Islands Bulletin of the Seismological Society of America, January 1, 1963; 53(1): 59 - 77. [Abstract] [PDF]
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