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The spatial distribution pattern of landslides triggered by the 20 April 2013 Lushan earthquake of China and its implication to identification of the seismogenic fault

ISSN号：0371-5736
期刊名称：《地质论评》
时间：0
分类：P642.22[天文地球—工程地质学;天文地球—地质矿产勘探;天文地球—地质学] P315.2[天文地球—地震学;天文地球—固体地球物理学;天文地球—地球物理学]
作者机构：[1]Key Laboratory of Active Tectonics and Volcano,Institute of Geology, China Earthquake Administration,Beijing 100029, China
相关基金：supported by the National Nat-ural Science Foundation of China(41202235 and 91214201)

作者： Chong Xu Xiwei Xu[1]

关键词：山体滑坡, 发震断层, 地震识别, 空间分布格局, 庐山, 密度分布, 引发, 蕴涵, Lushan earthquake , Landslides , Spatial distribution pattern, Blind-thrust-fault - Implication - Aerial photographs

中文摘要：

在 2013 年 4 月 20 日 Lushan M S 6.6 地震发生了以后，为这个事件的 seismogenic 差错的调查和鉴定变得一集中并且可争辩的问题。这个工作基于地调查和高分辨率的天线相片的视觉解释准备了与 Lushan 地震有关的一张起始的山崩库存地图并且为解决这个问题提供了证据上述。对可能的 seismogenic 差错的罢工方向垂直的三山崩密度侧面的分析证明许多山崩发生在 ShuangshiDachuan 差错(SDF ) 的矿脉基卒下盘上，没有差错附近的山崩密度的突然的变化。很少的山崩在 Dayi 差错(DF ) 附近被检测并且不也在那里的山崩密度变化。当山崩密度的明显的突然的变化出现了时，到西方的 Shangli 差错(WSF ) 的从西北的大约 12 km，和差错的挂的墙上的山崩密度显然比的高在矿脉基卒下盘上。因此，我们推断为 Lushan 地震的 seismogenic 差错是既不 SDF 也不 DF，相当可能，在这二之间定位的 WSF 指责，它是地球表面上的明显的线性踪迹。同时， coseismic 滑倒没向上宣传到地面，暗示 Lushan 地震被 blind-thrust-fault 在 WSF 下面孵化。

英文摘要：

After the 20 April 2013 Lushan Ms 6.6 earth- quake occurred, investigation and identification of the seismogenic fault for this event have become a focused and debatable issue. This work prepared an initial landslide inventory map related to the Lushan earthquake based on field investigations and visual interpretation of high-reso- lution aerial photographs and provided evidence for solv- ing the issue aforementioned. The analysis of three landslide-density profiles perpendicular to strike direction of the probable seismogenic fault shows that many land- slides occurred on the footwall of the Shuangshi-Dachuan fault （SDF）, without sudden change of landslide density near the fault. Very few landslides were detected near the Dayi fault （DF） and also no change of landslide density there. While obvious sudden change of landslide density appeared about 1-2 km from the northwest to the western Shangli fault （WSF）, and the landslide density on the hanging wall of the fault is obviously higher than that of on the footwall. Therefore, we infer that the seismogenic fault for the Lushan earthquake is neither the SDF nor the DF, rather probably the WSF located between these two faults, which is an evident linear trace on the earth surface. Meanwhile, the coseismic slip did not propagate upward to the ground, implying the Lushan earthquake was spawned by a blind-thrust-fault beneath the WSF.

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