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首页> 外文期刊>Journal of Asian earth sciences >Structure of the 1999 Chi-Chi earthquake rupture and interaction of thrust faults in the active fold belt of western Taiwan
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Structure of the 1999 Chi-Chi earthquake rupture and interaction of thrust faults in the active fold belt of western Taiwan

机译：台湾西部活动褶皱带1999年集集地震破裂结构与逆冲断层相互作用

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摘要

We summarize the structural characteristics of the surface ruptures of the 1999 Mw 7.6 Chi-Chi earthquake in western Taiwan and discuss the geological interaction of the Chelungpu fault with adjacent faults. Based on geological investigations, seismological analyses, and GPS measurements of surface co-seismic displacements, we describe the regional 3-D fault plane and slip distribution of the Chi-Chi earthquake and compare these to the geological features of the Chelungpu fault. We find that one key feature of the Chelungpu fault is the stratigraphy-controlled slip surface: at the level of the uppermost few kilometers, the Chelungpu fault slip plane generally follows the bedding plane of the Pliocene Chinshui shale. The second key feature of the Chelungpu fault is the difference in structurally geometric configuration between its northern and southern segments. The northern Fengyuan segment shows a bedding-parallel thrust fault within east-dipping strata in both footwall and hanging wall. In contrast, the southern Tsaotun segment exhibits east-dipping strata are over-thrust onto flat-lying recent alluvial deposits. These two features not only explain a hinterland imbricate thrusting on the hanging-wall of the Fengyuan segment, but also explain the change in strike of the Chi-Chi surface ruptures at the northern end. The southern end of the 1999 Chi-Chi rupture is interpreted to be linked to a series of NW-trending strike-slip faults. In particular, we propose that the Luliao strike-slip fault served as the lateral ramp of the Chelungpu fault, and the Gukeng strike-slip fault acted as a barrier to end the southern propagation of the 1999 rupture. Geomorphic features and paleoseismological data indicate that the range-front Chelungpu fault has generated large earthquakes during the last several thousand years. Alternatively, in the Miaoli area to the north and the Chiayi area to south, historical earthquakes as well as active geomorphic features are not restricted on the range-front thrust faults. Instead, more complicated structures, including tightly spaced folds, duplex structures, and strike-slip faults are involved in seismogenic processes. A more detailed investigation of regional structural characteristics is needed for mitigation against the seismic hazards in the 300-km-long active fold belt in western Taiwan, where several damaging large earthquakes have been documented during the last century.
机译：我们总结了台湾西部1999年Mw 7.6集集地震的表面破裂的结构特征，并讨论了切龙普断裂与相邻断裂的地质相互作用。基于地质调查，地震分析和GPS对地表同震位移的测量，我们描述了Chi-Chi地震的区域3-D断层平面和滑动分布，并将其与Chelungpu断层的地质特征进行比较。我们发现，契龙铺断裂的一个关键特征是地层控制的滑动面：在最上层的几千米处，契隆普断裂的滑动面通常遵循上新世钦水页岩的顺层平面。切伦浦断裂的第二个关键特征是其北部和南部部分之间在几何结构上的差异。丰原北段在下盘东和上盘东倾层中均表现出层理平行的逆冲断层。相比之下，南部的草屯段的东倾地层则被推覆到平整的近期冲积矿床上。这两个特征不仅说明了丰原地段悬壁上的内陆褶皱冲断，而且还解释了北端的集集地表破裂的走向变化。 1999年集集断裂的南端被解释为与一系列西北走向的走滑断层有关。特别是，我们建议将鲁廖走滑断层作为切隆浦断层的侧向斜坡，而古坑走滑断层则是结束1999年破裂南移的屏障。地貌特征和古地震资料表明，在最近的几千年中，山前锋切龙普断裂曾引起大地震。另外，在北部的苗栗地区和南部的嘉义地区，历史地震以及活跃的地貌特征并不局限于山前冲断层。取而代之的是，更复杂的结构（包括紧密间隔的褶皱，双相结构和走滑断层）参与了成地震过程。为了减轻台湾西部300公里长的活动褶皱带的地震灾害，需要对区域结构特征进行更详细的研究，在上个世纪已经记录了几次破坏性大地震。

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