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2013年4月20日芦山地震后,关于地震发震断层的判识与考察成为了地震学家关注的对象与争论的焦点.基于野外调查与可利用的高分辨率航片人工目视解译方法,初步建立了芦山地震滑坡空间分布图.从地震滑坡的角度开展芦山地震发震断层的分析与讨论,旨在为芦山地震发震构造研究提供地震滑坡方面的证据.综合垂直可能发震断层走向的3个地震滑坡密度剖面分析的结果为:双石-大川断裂的下盘区域发生了较多的滑坡,滑坡丰度在双石-大川断裂附近没有发生突变行为;滑坡在大邑断裂附近发育极少,滑坡密度没有发生突变行为;滑坡密度在上里西断裂NW方向1~2 km处发生了一次较明显的突变行为,上里西断裂的上盘滑坡丰度明显高于下盘.据此,本文得出了初步结论:在芦山地震中主要活动的断层既不是双石-大川断裂,也不是大邑断裂,更可能是两者之间的一条具有明显的线状地貌特征的上里西断层,断层错动并没有传到地表,为一次盲逆断层型的构造地震.
After the Lushan Earthquake on April 20, 2013, the identification and investigation of the seismogenic fault have become the focus of the seismologists’ attention and controversy.Based on the field investigation and available visual interpretation of high-resolution aerial photographs The spatial distribution map of Lushan earthquake landslide has been initially established.The analysis and discussion on the seismogenic fault of Lushan earthquake from the perspective of earthquake and landslide aims to provide evidence for the seismic seismogenesis of the Lushan earthquake.It can synthesize the vertical and possible seismogenic faults The results of three seismic landslide density profiles showed that there were more landslides in the lower part of Shicheng-Ochuan fault, and there was no abrupt change of landslide abundance near Shicheng-Daochuan fault. Landslides developed near Dayi fault There is no abrupt change of landslide density, and a more obvious abrupt change occurs in the landslide density of 1 ~ 2 km in the NW direction of Upper-West Fault, and the abundance of landslide on the upper Liuxi fault is obviously higher than that of the lower plate. , This paper concludes with the preliminary conclusion that the faults that are mainly active during the Lushan earthquake are neither the double-oak-okawa nor the Dayi fault, but more likely to be an obvious The linear topographic feature in the West fault, fault movement has not reached the surface, tectonic earthquake is a blind thrust fault type.