Faulting on the Anninghe fault zone, Southwest China in Late Quaternary and its movement model
Faulting on the Anninghe fault zone, Southwest China in Late Quaternary and its movement model
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DOI：
10.1007/s11589-007-0571-4
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发表时间：
2007-09
影响因子：
--
通讯作者：
Honglin He;Y. Ikeda
中科院分区：
文献类型：
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作者：
Honglin He;Y. Ikeda
安宁河断裂是西南地区重要的发震断裂带之一。当地历史记录显示，1536年曾发生过aM≥7的强烈地震。根据详细的航片解译和野外调查，我们获得了以下认识：①晚更新世以来的平均左旋走滑速率约为3. 7 mm/a;沿着断裂带除了主要的左旋走滑运动外，还存在重要的逆断层活动，安宁河断裂带的逆断层缩短速率约为1.7 × 4.0mm/a。如果将鲜水河断裂带简单地划分为安宁河断裂和大凉山断裂，也可以得到大凉山断裂带的滑动速率为3沿着7 mm/a，与安宁河断裂带的滑动速率相同。在野外考察的基础上，结合青藏地壳活动构造的最新认识，建立了安宁河断裂带的动力学模型。
The Anninghe fault is one of the significant earthquake-generating fault zones in the Southwest China. Local historical record shows that aM≥7 strong earthquake occurred in the year of 1536. On the basis of the detailed air-photographic interpretation and field investigation, we have acquired the following knowledge: ➀ The average sinistral strike-slip rate since the Late Pleistocene is about 3∼7 mm/a; ➁ There is important reverse faulting along the fault zone besides the main left-lateral strike-slip motion, and the shortening rate across the Anninghe fault zone due to the reverse faulting is about 1.7∼4.0 mm/a. If the Xianshuihe fault zone is simply partitioned into the Anninghe and Daliangshan faults, we can also get a slip rate of 3∼7 mm/a along the Daliangshan fault zone, which is the same as that on the Anninghe fault zone. Moreover, on the basis of our field investigation and the latest knowledge concerning the active tectonics of Tibetan crust, we create a dynamic model for the Anninghe fault zone.