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首页> 外文期刊>Journal of structural geology >Structural geology of a classic thrust belt earthquake: the 1999 Chi-Chi earthquake Taiwan (M_w = 7.6)
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Structural geology of a classic thrust belt earthquake: the 1999 Chi-Chi earthquake Taiwan (M_w = 7.6)

机译：一次典型的逆冲带地震的构造地质：1999年台湾集集地震（M_w = 7.6）

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摘要

We document the structural context of the 1999 Chi-Chi earthquake (M_w = 7.6) in western Taiwan, which is one of the best-instrumented thrust-belt earthquakes. The main surface break and large slip (3-10 m) is on two segments of the shallow otherwise aseismic bedding-parallel Chelungpu-Sanyi thrust system, which shows nearly classic ramp-flat geometry with shallow detachments (1-6 km) in the Pliocene Chinshui Shale and Mio-Pliocene Kueichulin/Tungkeng Formations. However, rupture is complex, involving at least six faults, including a previously unknown deeper thrust (8-10 km) on which the rupture began. We compare the coseismic displacements with a new 3D map of the Chelungpu-Sanyi system. The displacements are spatially and temporally heterogeneous and well correlated with discrete geometric segments of the 3D shape of the fault system. Geodetic displacement vectors are statistically parallel to the nearest adjacent fault segment and are parallel to large-scale oblique fault corrugations. The displacement magnitudes are heterogeneous at several scales, which requires in the long term other non-Chi-Chi events or significant aseismic deformation. The Chelungpu thrust has a total displacement of ～14 km but the area of largest Chi-Chi slip (～10 m) is on a newly propagated North Chelungpu Chinshui detachment (～0.3 km total slip) which shows abnormally smooth rupture dynamics.
机译：我们记录了台湾西部1999年的Chi-Chi地震（M_w = 7.6）的结构背景，这是仪器化程度最高的推力带地震之一。主表面破裂和大滑移（3-10 m）位于浅层的否则为抗震层理的平行的Chelungpu-Sanyi逆冲推力系统的两段上，这显示了近经典的斜坡平坦的几何形状，浅层分离（1-6 km）。上新世钦水页岩和中新世新纪粉林/东坑组。然而，破裂是复杂的，包括至少六个断层，包括以前未知的开始破裂的更深的推力（8-10 km）。我们将同震位移与Chelungpu-Sanyi系统的新3D地图进行了比较。位移在空间和时间上是异质的，并且与断层系统的3D形状的离散几何段具有良好的相关性。大地位移向量在统计上平行于最近的邻近断层段，并且平行于大规模斜断层皱纹。位移大小在几个尺度上是不均匀的，从长远来看，这需要其他非Chi-Chi事件或显着的地震变形。车隆浦逆冲总位移约为〜14 km，但最大的Chi-Chi滑移区域（〜10 m）位于新近发展的北车隆埔钦水支流（〜0.3 km总滑移），表现出异常光滑的破裂动力。

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