Seismic reversal pattern for the 1999 Chi-Chi, Taiwan, MW 7.6 earthquake |
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Authors: | Yih-Min Wu Chien-chih Chen |
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Institution: | aDepartment of Geosciences, National Taiwan University, Taipei, 106 Taiwan ROC;bDepartment of Earth Sciences and Inst. Geophysics, National Central University, Jhongli, 320 Taiwan ROC |
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Abstract: | We in this study have calculated the standard normal deviate Z-value to investigate the variations in seismicity patterns in the Taiwan region before and after the Chi-Chi earthquake. We have found that the areas with relatively high seismicity in the eastern Taiwan became abnormally quiet before the Chi-Chi earthquake while the area in the central Taiwan with relatively low seismicity showed unusually active. Such a spatially changing pattern in seismicity strikingly demonstrates the phenomenon of “seismic reversal,” and we here thus present a complete, representative cycle of “seismic reversal” embedding in the changes of seismicity patterns before and after the Chi-Chi earthquake. |
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Keywords: | Seismic reversal Seismic quiescence Seismic activation Chi-Chi earthquake |
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