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首页> 外文期刊>Journal of Asian earth sciences >Seismic behavior in central Taiwan: Response to stress evolution following the 1999 M_w 7.6 Chi-Chi earthquake
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Seismic behavior in central Taiwan: Response to stress evolution following the 1999 M_w 7.6 Chi-Chi earthquake

机译：台湾中部的地震行为：1999年M_w 7.6集集地震后对应力演变的响应

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摘要

Following the 1999 M_w 7.6 Chi-Chi earthquake, a large amount of seismicity occurred in the Nantou region of central Taiwan. Among the seismic activities, eight M_w ≥ 5.8 earthquakes took place following the Chi-Chi earthquake, whereas only four earthquakes with comparable magnitudes took place from 1900 to 1998. Since the seismicity rate during the Chi-Chi postseismic period has never returned to the background level, such seismicity activation cannot simply be attributed to modified Omori's Law decay. In this work, we attempted to associate seismic activities with stress evolution. Based on our work, it appears that the spatial distribution of the consequent seismicity can be associated with increasing coseismic stress. On the contrary, the stress changes imparted by the afterslip; lower crust-upper mantle viscoelastic relaxation; and sequent events resulted in a stress drop in most of the study region. Understanding seismogenic mechanisms in terms of stress evolution would be beneficial to seismic hazard mitigation.
机译：在1999年M_w 7.6集集地震之后，台湾中部南投地区发生了大量地震活动。在地震活动中，集集地震后发生了8次M_w≥5.8级地震，而从1900年到1998年仅发生了4次同等震级的地震。由于集集地震后的地震活动率从未恢复到本底。在这种情况下，这种地震活动的激活不能简单地归因于修正的大森定律衰减。在这项工作中，我们试图将地震活动与应力演化联系起来。根据我们的工作，似乎地震活动的空间分布可能与同震应力的增加有关。相反，后滑带来的应力变化；下地壳上地幔粘弹性松弛;随后的事件导致大部分研究区域的压力下降。从应力演化的角度理解地震发生机制将有助于减轻地震危险。

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