Locations and types of ruptures involved in the 2008 Sichuan earthquake inferred from SAR image matching
Locations and types of ruptures involved in the 2008 Sichuan earthquake inferred from SAR image matching
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DOI：
10.1029/2008gl036907
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发表时间：
2009-04
影响因子：
5.2
通讯作者：
Tomokazu Kobayashi;Y. Takada;M. Furuya;M. Murakami
中科院分区：
文献类型：
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作者：
Tomokazu Kobayashi;Y. Takada;M. Furuya;M. Murakami
在2008年四川地震的分析中，我们通过应用SAR偏移跟踪方法检测了龙门山断裂带（LMSFZ）附近的详细地面位移。高程相关校正对于实现亚米级精度是必不可少的。沿断裂带沿着200 km长的范围内出现了相对运动为101 ~ 2 m的尖锐位移间断，表明在构成断裂带的几条活动断裂中，主破裂已在北川断裂上进行，并在北川断裂的北东向延伸部分发现了新的活动断裂。BF上的破裂的特征是在东北部的右行运动，而在西南部的斜右行逆冲滑动建议。与东北部仅在BF上进行了一次主要破裂相反，在西南部，在彭官山的东南脚发生了多次逆冲破裂。
We have detected detailed ground displacements in the proximity of the Longmen Shan fault zone (LMSFZ) by applying a SAR offset‐tracking method in the analysis of the 2008 Sichuan earthquake. An elevation‐dependent correction is indispensable for achieving sub‐meter accuracy. A sharp displacement discontinuity with a relative motion of ∼1–2 m appears over a length of 200 km along the LMSFZ, which demonstrates that the main rupture has proceeded on the Beichuan fault (BF) among several active faults composing the LMSFZ, and a new active fault is detected on the northeastward extension of the BF. The rupture on the BF is characterized by a right‐lateral motion in the northeast, while in the southwest an oblique right‐lateral thrust slip is suggested. In contrast to the northeast, where a major rupture proceeded on the BF only, in the southwest multiple thrust ruptures have occurred in the southeastern foot of the Pengguan massif.