SLIP RATE ON THE SOUTH SEGMENT OF DALIANGSHAN FAULT ZONE

doi:10.3969/j.issn.0253-4967.2012.02.007

Abstract

Abstract: Daliangshan Fault zone constitutes an important part of the eastern boundary of Sichuan-yunnan active block. The studies of slip rate along the fault is not only significant to the crust movement and deformation pattern on the southeast edge of Tibetan Plateau,but also has great value in seismic hazard assessment and mid-and long-term forecasting of earthquake of the Daliangshan region. Through detailed field work along the south segment of Daliangshan Fault zone,namely the Butuo Fault and the Jiaojihe Fault,and based on accurate RTK(GPS)survey for the alluvial fans and activity dating,we suggest that left-lateral slip rate of the south segment of the fault zone is between 2.5～4.5mm/a,and the slip rate of Jiaojihe Fault is slightly higher than that of the Butuo Fault. Due to partitioning of part of the strike-slip component on the Daliangshan Fault zone,there is an obvious deficit in the displacement and slip rate on the Anninghe-Zemuhe Fault,compared to the Xianshuihe and Xiaojiang Faults. Comparing to the slip rates between Daliangshan Fault and Anninghe-Zemuhe Fault,it is found that they have similar horizontal slip rate,indicating the seismicity level of the Daliangshan Fault will not be lower than that of Anninghe-Zemuhe Fault. As the Daliangshan Fault gradually replaces the role of Anninghe-Zemuhe Fault in the Xianshuihe-Xiaojiang Fault system,the seismicity on the Daliangshan Fault zone will increase,and the Dalianghan region will have a higher risk of earthquake damage.

Key words: Daliangshan Fault, left-lateral slip rate, offset landform

摘要： 大凉山断裂带是川滇活动块体东边界的重要组成部分,其活动速率的估计不仅对评价青藏高原东南边缘的地壳运动和变形模型具有重要理论意义,还对大凉山地区的地震危险性评价和地震中长期预测具有重要的应用价值。通过对大凉山断裂带南段交际河断裂和布拖断裂的详细野外调查、典型构造地貌GPS精细测量以及断错地貌的时间约束,获得大凉山断裂带南段全新世以来的滑动速率为2.5～4.5mm/a,交际河断裂平均滑动速率略大于布拖断裂的滑动速率。对比滑动速率发现,大凉山断裂带南段与鲜水河-小江断裂系中段西支的安宁河、则木河断裂带的水平滑动速率相当,表明大凉山断裂带活动强度不低于安宁河和则木河断裂带,随着大凉山断裂带逐渐取代安宁河和则木河断裂在鲜水河-小江断裂系中的作用,大凉山断裂带的活动强度将增强。

关键词: 大凉山断裂, 左旋位移速率, 错断地貌

CLC Number:

P315.2

WEI Zhan-yu, HE Hong-lin, SHI Feng, XU Yue-ren, BI Li-si, SUN Hao-yue. SLIP RATE ON THE SOUTH SEGMENT OF DALIANGSHAN FAULT ZONE[J]. SEISMOLOGY AND GEOLOGY, 2012, (2): 282-293.

魏占玉, 何宏林, 石峰, 徐岳仁, 毕丽思, 孙浩越. 大凉山断裂带南段滑动速率估计[J]. 地震地质, 2012, (2): 282-293.

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