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Near-field source parameters by finite-source theoretical seismograms

ADOLPHO BLOCH GEOPHYSICAL OBSERVATORY DEPARTMENT OF APPLIED MATHEMATICS WEIZMANN INSTITUTE OF SCIENCE, REHOVOT, Israel

Abstract

Near-field seismograms due to finite faulting in a half-space were calculated. An attempt is made to evaluate near-field fault parameters by using two criteria: (1) agreement of observed and theoretical pulse width; and (2) agreement of observed and calculated amplitude ratios of the horizontal components of motion. Using this method we have investigated possible fault parameters of an earthquake along the San Andreas fault (source depth 12.5 km), recorded at two stations (epicentral distance 2.3, 5.5 km).

It is found that computed seismograms are strongly dependent on the point in which a unilateral fracture begins. Assuming different initial failure points within the uncertainty region of the hypocentral location may effect fault parameter solutions. Thus, fault parameters obtained in this study should not be viewed as unique. However, we have shown, that for an assumed point and dynamics model, it is possible to determine rupture direction and source parameters.

The seismic moment found in this study is weakly dependent on the dynamics model assumed.

Footnotes

Affiliated with ISRAEL ATOMIC ENERGY COMMISSION LICENSING DIVISION P.O.B. 17120 TEL-AVIV, ISRAEL

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				F. ABRAMOVICI and J. GAL-EZER Seismic waves from finite faults in layered media Bulletin of the Seismological Society of America, December 1, 1979; 69(6): 1693 - 1714. [Abstract] [PDF]

				M. ISRAEL and R. L. KOVACH Near-field motions from a propagating strike-slip fault in an elastic half-space Bulletin of the Seismological Society of America, August 1, 1977; 67(4): 977 - 994. [Abstract] [PDF]