黄伟亮, 杨虔灏, 吕艳, 等. 2020.秦岭北麓古滑坡分布特征与地震活动关系研究[J].工程地质学报, 28(6): 1292-1304. doi: 10.13544/j.cnki.jeg.2019-383.
    引用本文: 黄伟亮, 杨虔灏, 吕艳, 等. 2020.秦岭北麓古滑坡分布特征与地震活动关系研究[J].工程地质学报, 28(6): 1292-1304. doi: 10.13544/j.cnki.jeg.2019-383.
    Huang Weiliang, Yang Qianhao, Lü Yan, et al. 2020. Relationship between distribution characteristics of prehistoric landslides and seismic activity along Qinling piedmont fault[J]. Journal of Engineering Geology, 28(6): 1292-1304. doi: 10.13544 /j.cnki.jeg.2019-383.
    Citation: Huang Weiliang, Yang Qianhao, Lü Yan, et al. 2020. Relationship between distribution characteristics of prehistoric landslides and seismic activity along Qinling piedmont fault[J]. Journal of Engineering Geology, 28(6): 1292-1304. doi: 10.13544 /j.cnki.jeg.2019-383.

    秦岭北麓古滑坡分布特征与地震活动关系研究

    RELATIONSHIP BETWEEN DISTRIBUTION CHARACTERISTICS OF PREHISTORIC LANDSLIDES AND SEISMIC ACTIVITY ALONG QINLING PIEDMONT FAULT

    • 摘要: 地震滑坡是严重的次生地质灾害,也是改变地球表层地貌形态的重要力量,对地震诱发滑坡的规模、数量、类型等研究是地震危险性评价的重要手段,也是认识地震地质灾害的主要方法和途径。位于西安市以南的秦岭山脉北麓中段发育有一条长约50 km的古滑坡群,且基本与山前秦岭北缘断裂带平行展布,普遍认为该古滑坡群可能是由于秦岭北缘断裂的强震活动所诱发,但对于诱发地震的震级大小和影响范围尚没有细致研究。本文通过利用资源3号卫星立体影像制作的高分辨率数值高程模型(DEM)和高分辨率多光谱遥感影像对秦岭北麓古滑坡区域进行了详细的解译工作,并结合对部分古滑坡体进行了野外调查,制作了详细秦岭北麓古滑坡分布图。结果表明:解译出了43处古滑坡,主要集中分布在70 km×10 km的范围内,总滑坡面积是16.57 km2。通过利用地震震级与滑坡面积频度分布的关系分析了诱发秦岭北麓古滑坡群的地震规模,得到了诱发秦岭北麓古滑坡群的地震震级应在7.6~8.1之间。并结合区域地震构造环境以及与现代地震诱发滑坡事件的对比,认为秦岭北麓具有发生7.5级以上地震的潜在能力。该研究对认识现今秦岭北麓古滑坡的成因提供了定量化的数据支持,也对理解秦岭北缘断裂的地震危险性具有重要的现实意义。

       

      Abstract: Earthquake-induced landslides are serious secondary geological hazards,and they are also an important force to change the topography of the earth surface. Research on the scale,number,and type of earthquake-induced landslides is an important method for seismic risk assessment and the main method for understanding seismic geological disasters and approaches. The scale,quantity and the type of earthquake-induced landslide is an important way to evaluate the seismic risk,and also the main approach to understand the seismic hazard. There is a prehistoric landslide group of about 50 km long in the middle part of the northern foothills of the Qinling Mountains. It is distributed in parallel with the Qingling Piedmont fault. The recent research generally believes that the prehistoric landslide group was probably induced by the significance earthquake of the Qingling Piedmont fault activity. But there is no detailed study on the magnitude and influence range of this earthquake. In this paper,we use the high-resolution digital elevation model(DEM)that is produced from the ZY-3 satellite stereo image,and multispectral remote sensing image to mapping the landslide area in detail. Combined with the some field investigation,we finally obtain a detailed map of the prehistoric landslide distribution in the Qinling Piedmont area. In the end,totaling 43 prehistoric landslides are interpreted and concentrated in a area of 70×10 km2. Based on the relationship between the moment magnitude and the frequency-area distribution(FAD) of inventories of triggered landslides,we analyze the earthquake scale of the prehistoric landslide group in Qinling Piedmont area. The magnitude of the earthquake that triggered the prehistoric landslide group in the north Qinling Piedmont should be between 7.6 and 8.1. By combining the regional seismic tectonic environment and the comparison with modern earthquake-induced landslide events,we conclude that the Qinling Piedmont fault has the potential to produce earthquakes of more than 7.5 magnitude. This research provides quantitative data support for understanding the causes of the prehistoric landslide group in the Qingling Piedmont area,and also has practical significance for understanding the seismic risk of the Qinling Piedmont fault.

       

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