2017年8月8日四川省九寨沟MS7.0地震触发滑坡全景

doi:10.3969/j.issn.0253-4967.2018.01.017

地震地质 ›› 2018, Vol. 40 ›› Issue (1): 232-260.DOI: 10.3969/j.issn.0253-4967.2018.01.017

2017年8月8日四川省九寨沟M_S7.0地震触发滑坡全景

许冲¹, 王世元², 徐锡伟¹, 张合³, 田颖颖¹, 马思远¹, 房立华⁴, 鲁人齐¹, 陈立春¹, 谭锡斌¹

1. 中国地震局地质研究所, 活动构造与火山重点实验室, 北京 100029;
2. 四川省地震局, 成都 610041;
3. 河北省地震局, 石家庄 050021;
4. 中国地震局地球物理研究所, 北京 100081

收稿日期:2017-11-14 修回日期:2017-12-25 出版日期:2018-02-20 发布日期:2018-04-13
作者简介:许冲,男,1982年生,2010年在中国科学院地质与地球物理研究所获博士学位,研究员,研究方向为滑坡地震地质,E-mail:xc11111111@126.com。
基金资助:
十三五国家重点研发计划（2017YFB0504104）、国家自然科学基金（41661144037）与中国地震局"四川省九寨沟7.0级地震科学研究"项目共同资助

A PANORAMA OF LANDSLIDES TRIGGERED BY THE 8 AUGUST 2017 JIUZHAIGOU, SICHUAN M_S7.0 EARTHQUAKE

XU Chong¹, WANG Shi-yuan², XU Xi-wei¹, ZHANG He³, TIAN Ying-ying¹, MA Si-yuan¹, FANG Li-hua⁴, LU Ren-qi¹, CHEN Li-chun¹, TAN Xi-bin¹

1. Key Laboratory of Active Tectonics and Volcano, Institute of Geology, China Earthquake Administration, Beijing 100029, China;
2. Sichuan Earthquake Agency, Sichuan Chengdu 610041, China;
3. Hebei Earthquake Agency, Hebei Shijiazhuang 050021, China;
4. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China

Received:2017-11-14 Revised:2017-12-25 Online:2018-02-20 Published:2018-04-13

摘要/Abstract

摘要： 2017年8月8日的四川省九寨沟县M_S7.0地震触发了大量滑坡。全面客观地获取地震滑坡发生全景，对于理解地震滑坡宏观机制、发育强度、分布样式与规律，灾区恢复重建与滑坡防灾减灾具有重要意义。文中利用天、空、地相结合的手段，获取本次地震触发滑坡全景。同震滑坡主要分布区内有4条公路，沿线同震滑坡最严重的为金铃海—夏莫段与九道拐—九寨天堂段。类型以中型与小型破碎型滑坡为主，也有少量的大型滑坡与碎屑流。开展了有0.2m超高分辨率震后航片覆盖的五花海区域（11.84km²）与扎如寺—上四寨村沿线（47.07km²）的滑坡分布详细调查。结果表明，受发震断层的影响，五花海区域的同震滑坡发育程度（1 088处滑坡，总面积1.514km²）远高于扎如寺—上四寨村沿线（528处滑坡，总面积0.415km²）。基于Geoeye-1震后影像开展了极震区同震滑坡解译，得到本次地震触发的超过4 800处滑坡，总面积约9.6km²，这些滑坡在空间上与推测发震断层位置、余震分布具有良好的对应关系。震区发育的强度弱化斜坡、悬停在高坡位的堆积体与停留在沟谷中的滑坡松散堆积体，后续在强余震或强降雨条件下再次失稳并形成新的滑坡与泥石流的可能性较大，滑坡与泥石流等地质灾害问题将成为震后恢复重建面临的最重要问题之一。

关键词: 九寨沟M_S7.0地震, 滑坡, 遥感, 目视解译, 发震断层

Abstract: The M_S7.0 Jiuzhaigou earthquake in Sichuan Province of 8 August 2017 triggered a large number of landslides. A comprehensive and objective panorama of these landslides is of great significance for understanding the mechanism, intensity, spatial pattern and law of these coseismic landslides, recovery and reconstruction of earthquake affected area, as well as prevention and mitigation of landslide hazard. In this paper, we use the trinity method of space, sky and earth to create a panorama of the landslides triggered by this event. There are 4 roads in the distribution area of the coseismic landslides. The Jinglinghai-Xiamo and Jiudaoguai-Jiuzhaitiantang road sections register the most serious coseismic landslides. The landslides are mainly of moderate-and small-scales, and also with a few large landslides and avalanches. A detailed visual interpretation of the coseismic landslides is performed in two areas of Wuhuahai(11.84km²) and Zharusi-Shangsizhai village(47.07km²), respectively. The results show the overall intensity of landsliding(1088 landslides, a total area 1.514km²) in the Wuhuahai area is much higher than those in the Zharusi-Shangsizhai village area(528 landslides, a total area 0.415km²). On the basis of a scene of post-earthquake Geoeye -1 satellite images, we delineate more than 4 800 coseismic landslides with a total occupation area 9.6km². The spatial pattern of these landslides is well related with the locations of the inferred seismogenic fault and aftershocks. Widely distributed earthquake-affected weakened slopes, residual loose materials staying at high-position slopes and in valleys have greater possibilities to fail again and generate new landslides or debris flows under the conditions of strong aftershocks or heavy rainfalls in the future. Geological hazard from these events will become one of the most serious problems in the recovery and reconstruction of the earthquake-affected area which should receive much attention.

Key words: Jiuzhaigou M_S7.0 earthquake, landslide, trinity of space, remote sensing, visual interpretation, seismogenic fault

中图分类号:

P315.9

许冲, 王世元, 徐锡伟, 张合, 田颖颖, 马思远, 房立华, 鲁人齐, 陈立春, 谭锡斌. 2017年8月8日四川省九寨沟M_S7.0地震触发滑坡全景[J]. 地震地质, 2018, 40(1): 232-260.

XU Chong, WANG Shi-yuan, XU Xi-wei, ZHANG He, TIAN Ying-ying, MA Si-yuan, FANG Li-hua, LU Ren-qi, CHEN Li-chun, TAN Xi-bin. A PANORAMA OF LANDSLIDES TRIGGERED BY THE 8 AUGUST 2017 JIUZHAIGOU, SICHUAN M_S7.0 EARTHQUAKE[J]. SEISMOLOGY AND GEOLOGY, 2018, 40(1): 232-260.

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2017年8月8日四川省九寨沟M_S7.0地震触发滑坡全景

A PANORAMA OF LANDSLIDES TRIGGERED BY THE 8 AUGUST 2017 JIUZHAIGOU, SICHUAN M_S7.0 EARTHQUAKE

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2017年8月8日四川省九寨沟MS7.0地震触发滑坡全景

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2017年8月8日四川省九寨沟M_S7.0地震触发滑坡全景

A PANORAMA OF LANDSLIDES TRIGGERED BY THE 8 AUGUST 2017 JIUZHAIGOU, SICHUAN M_S7.0 EARTHQUAKE