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A procedure to resolve areas of different source mechanism when using the method of composite nodal plane solution

DEPT. DE GEOSCIENCIAS UNIVERSIDAD DE BRASILIA, 70.000, BRASILIA D.F. Brasil

Abstract

The composite nodal plane solution method fails when it is applied to a region where the events have different source mechanism in different areas. Presented here is a systematic procedure to delimit those areas and find their particular source mechanism. In its first step, the method consists of a graphical analysis of the regional distribution of P first motion data of all events as recorded at each station. From that analysis, it is possible to identify small areas where the events have the same source mechanism. In a second step, those elemental areas are expanded into adjacent areas with compatible P data until they cover the whole seismic region under study. The method resolves the source mechanism in each area and allows the identification of anomalous ones.

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