SOURCE PARAMETERS RELEVANT TO HETERO-GENEITY OF A FAULT PLANE
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概要
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Accelerograms due to 16 earthquakes with JMA magnitude from 5.5 to 7.4 are analyzed. Second corner frequencies for the earthquakes are in a range from 1 to 8 Hz, and ratios of the rms stress-drop to the global stress-drop are from 2 to 10. The second corner frequency increases with the ratio of the rms stress-drop to the global stress-drop, and it is almost independent of the characteristic length of the fault plane. Based on stochastic source models, the second corner frequency is inversely proportional to an average size of element faults constituting a fault plane, so that the present result suggests that the average size decreases with increase in the heterogeneity of stress-drop on the fault plane. Also, the result implies that the average size of element faults is almost independent of the entire fault size for the earthquakes analyzed in this study.
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