Title

Estimation of earthquake source parameters of the May 4, 1972 event of the Hellenic arc by the inversion of waveform data

Abstract

Average source parameters of the May 4, 1972 (Ms = 6.5) earthquake, southwest of Crete, are obtained by the inversion of body waves. A source depth of 40 km is determined, which places the source in the mantle. The source parameters of the major double-couple are: strike = 309 °; dip = 18 °; rake = 89 ° and seismic moment M0 = 2.62 × 1025 dyn cm. The source-time function is of ∼ 5 s duration with a long rise time. The mechanism obtained corresponds to a pure thrust with the P-axis almost perpendicular to the Hellenic arc. Although a point source is assumed, the resulting synthetics match satisfactorily the observed waveforms. © 1989.

Publication Title

Physics of the Earth and Planetary Interiors

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