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Bulletin of the Seismological Society of America; December 1993; v. 83; no. 6; p. 1855-1870
© 1993 Seismological Society of America
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Source retrieval for deep local earthquakes with broadband records

MASAYUKI KIKUCHI and MIZUHO ISHIDA

DEPARTMENT OF PHYSICS YOKOHAMA CITY UNIVERSITY, YOKOHAMA, Japan
NATIONAL RESEARCH INSTITUTE FOR EARTH SCIENCE AND DISASTER PREVENTION, TSUKUBA, Japan

Abstract

Body wave data recorded at a small network of broadband seismograph stations are analyzed to investigate local events with focal depths deeper than about 50 km. For these events the initial portion of P-wave displacement represents well the source time function with a scaler correction for the seismic moment. The magnitudes of the analyzed earthquakes range from MW = 3.1 to 6.5. It is shown that the seismic moment M0 and the pulse width {tau} are well correlated as M0/{tau}3 = constant, indicating that the stress drop is largely constant. This dynamic similarity seems to be valid for a vast range of earthquake sizes: MW = 1 ~ 8. It is also shown that source complexity such as a multiple shock nature is not a characteristic of only large earthquakes but is often observed even for small earthquakes.




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