The Activity of the Yaziba Fault on the Lower Reaches of the Jinsha River, Southwestern China: Indirect Evidence from Paleo Earthquakes and Ancient Landslides
The Activity of the Yaziba Fault on the Lower Reaches of the Jinsha River, Southwestern China: Indirect Evidence from Paleo Earthquakes and Ancient Landslides
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中国西南金沙江下游鸭子坝断裂的活动性：古地震和古滑坡的间接证据
DOI：
10.1155/2019/5020357
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发表时间：
2019-05
影响因子：
1.8
通讯作者：
Xu Chong
中科院分区：
文献类型：
--
作者：
Cui Yulong;Deng Jianhui;Xu Chong
本文采用野外调查和遥感解译相结合的方法，获取了雅兹坝断裂带的几何形态及其附近滑坡的分布特征，以确认雅兹坝断裂带的强烈活动力，为防灾减灾和水库安全提供必要的信息。对几个新的地震事件进行了定年，并对断裂带的古地震事件及其时间间隔进行了分析。然后对一个典型滑坡进行了分析，并采用极限平衡法确定了其失稳性。主要研究结果如下：(1)雅兹坝断裂延伸约20 km；(2)断裂带内共发生滑坡164次，整个研究区LND达到0.1 km−2，LAP达到0.07，且LND和LAP随距离雅兹坝断裂带的增加而逐渐减小；(3)获得39个测年数据，总结出19次古地震，发现地震时间间隔从14.7万年缩短至3800年前；(4)道马坎滑坡水平地震加速度为0.6 g，表明其为地震滑坡。该综合方法结合断层的几何特征、古地震资料、区域滑坡分布以及该地区典型滑坡的岩土工程分析，间接确定了断层的活动性，为研究山区断层活动性提供了参考。
In this paper, in order to confirm the strong activity of the Yaziba Fault and provide information needed for disaster prevention and mitigation and safety of the reservoir, we use field investigations and remote sensing interpretations to obtain the geometry of the Yaziba Fault and the distribution of the associated nearby landslides. Several new events are dated, and the paleo earthquake events in the fault area and their time intervals are analyzed along with previously dated events. Then, a typical landslide case is analyzed, and its instability is determined using the limit equilibrium method. The main results of our study are as follows: (1) the Yaziba Fault extends for 20 km; (2) 164 landslides have occurred in the fault area, the LND reached 0.1 km−2, and the LAP reached 0.07 for the entire research area, and the LND and LAP gradually decrease with increasing distance from the Yaziba Fault; (3) 39 dating dates are obtained and 19 paleo earthquakes are concluded, from which the time interval of earthquakes shortened from 147,000 to 3800 years ago is found; and (4) the Daomakan landslide had a 0.6 g horizontal seismic acceleration, which indicates that it was an earthquake landslide. This comprehensive method combined the geometric characteristics of the fault, paleo earthquake data, the regional landslide distribution, and the geotechnical engineering analysis of typical landslides in the area to indirectly determine the fault’s activity and provide a reference for the study of fault activity in mountainous areas.
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