论文信息 - Single station CMT; Application to the Michoacan, Mexico, Earthquake of September 19, 1985

Single station CMT; Application to the Michoacan, Mexico, Earthquake of September 19, 1985

Observations of three-dimensional ground motion at a single point on the surface of the Earth following an earthquake can be sufficient to determine the zeroth order moment tensor of the event. We adapt the centroid-moment tensor (CMT) method [Dziewonski et al., 1981] of analysis to single station data and apply it to the September 19, 1985 Michoacan earthquake. The obtained mechanism indicates faulting on a shallow plane, consistent with the ongoing subduction of the Cocos plate. The scalar moment is 1.3 × 1028 dyne-cm. A direct deconvolution of the observed P-wave train indicates that the moment release occurred in two subevents, each of 20 seconds duration with a peak-to-peak separation in time of 25 seconds.

A. Dziewoński | G. Ekström | J. Steim

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