Abstract
We investigated how the multiple inverse method developed by Yamaji works for the focal mechanism data. A numerical experiment with artificial data revealed that the stresses obtained for the focal mechanism data including auxiliary fault planes agree with those for the data consisting only of actual fault planes. Another numerical experiment showed that the method can retrieve the plural stresses when applied to artificial data that consist of focal mechanisms originating from different stresses. When applied to the focal mechanisms of earthquakes in and around the rupture zone of the 2004 Sumatra-Andaman earthquake, the method could determine the stresses that were not resolved in the previous study, thus allowing us to discuss the tectonic stress field in more detail. We proposed an objective criterion for determining the significant stresses from among the plural inverted solutions. Although the criterion still needs to be refined, we consider that it provides a useful tool for evaluating the relative significance of the plural stresses inverted by the multiple inverse method.
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Schedule a callMore From: Zisin (Journal of the Seismological Society of Japan. 2nd ser.)
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