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Source mechanism and surface-wave attenuation studies for Tibet earthquake of July 14, 1973

NATIONAL GEOPHYSICAL RESEARCH INSTITUTE, UPPAL ROAD, HYDERABAD 500007 India

Abstract

Focal mechanism for Tibet earthquake of July 14, 1973 (M = 6.9, m_b = 6.0) has been determined using the P-wave first motions, S-wave polarization angles, and surface-wave spectral data. A normal faulting is obtained with a plane having strike N3°W, dip 51°W, and slip angle 81°. The source parameters have been estimated for this event using the body- and surface-wave spectra. The seismic moment, fault length, apparent stress, stress drop, seismic energy release, average dislocation, and fault area are estimated to be 2.96 x 10²⁶ dyne-cm, 27.4 km, 14 bars, 51 bars, 1.4 x 10²² ergs, 157 cm, and 628 km², respectively. The high stress drop and apparent stress associated with this earthquake indicate that the high stresses are prevailing in this region. The specific quality factor Q is found to vary from 21 to 1162 and 22 to 1110 for Rayleigh and Love waves, respectively. These wide ranges of variation in the attenuation data may be due to the presence of heterogeneity in the crust and upper mantle.

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