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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Change of crustal gravitational potential energy in the Taiwan orogen by the Chi-Chi earthquake sequence
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Change of crustal gravitational potential energy in the Taiwan orogen by the Chi-Chi earthquake sequence

机译：赤集地震序列对台湾造山带地壳重力势能的变化

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摘要

The active convergence between the northwest corner of the Philippine Sea Plate and the southeast margin of the Eurasian Plate has given rise to the Taiwan mountain-building and produced numerous earthquakes. Among the earthquakes, the 1999 Chi-Chi earthquake is the largest one recorded in the century. In this study, we examine the crustal gravitational potential energy (GPE) change in the Taiwan orogen caused by the Chi-Chi earthquake sequence, which was catalogued by the regional broadband seismometer array for a whole year. As a result, we find that the crust was going up and down randomly during the earthquake sequence, but an overall cumulative gain of the crustal GPE, +1.82*10~(16) J, was rapidly achieved in 1 month after the main shock. The crustal GPE was nearly still afterwards and reached +1.90*10~(16) J in 1 year. Spatially, although the main surface faulting has occurred in western Taiwan, the crustal GPE gain is mainly distributed in central Taiwan at the area where the existing crustal GPE is high and the existing lithospheric GPE is relatively low. The crustal GPE loss by the Chi-Chi earthquake sequence can also be observed and is generally distributed at both sides of the crustal GPE gain area. The crustal GPE gain mainly found in central Taiwan corroborates that the uplift of the Taiwan orogen is principally taking place in central Taiwan, rather than in the more hazardous western Taiwan.
机译：菲律宾海板块西北角与欧亚板块东南边缘之间的活跃交汇，造就了台湾山区的建设，并引发了无数地震。在地震中，1999年的集集地震是本世纪以来最大的一次地震。在这项研究中，我们研究了由Chi-Chi地震序列引起的台湾造山带中的地壳重力势能（GPE）变化，该序列由区域宽带地震仪阵列对整年进行了分类。结果，我们发现在地震序列中地壳是随机上升和下降的，但是在主震发生后的1个月内，地壳GPE的整体累积增益为+ 1.82 * 10〜（16）J。 。之后，地壳GPE几乎保持静止，并在1年内达到+ 1.90 * 10〜（16）J。在空间上，尽管主要表面断层发生在台湾西部，但地壳GPE增益主要分布在台湾中部，即现有地壳GPE较高而现有岩石圈GPE相对较低的区域。还可以观察到由Chi-Chi地震序列引起的地壳GPE损失，并且通常分布在地壳GPE增益区域的两侧。地壳GPE的增加主要在台湾中部发现，这证实了台湾造山带的隆升主要发生在台湾中部，而不是在危险程度更大的台湾西部。

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