Characteristics and triggering mechanism of Xinmo landslide on 24 June 2017 in Sichuan, China
Authors:Su, Li-junHu, Kai-hengZhang, Wei-fengWang, JiaoLei, YuZhang, Chong-leiCui, PengPasuto, AlessandroZheng, Quan-hong
Source:JOURNAL OF MOUNTAIN SCIENCE
Volume:14
Published:2017
Document Type:Article
Abstract:At 5: 39 AM on 24 June 2017, a huge landslide-debris avalanche occurred on Fugui Mountain at Xinmo village, Diexi town, Maoxian county, Sichuan province, China. The debris blocked the Songpinggou River for about 2 km, resulting in a heavy loss of both human lives and properties (10 deaths, 3 injuries, 73 missing, and 103 houses completely destroyed). The objectives of this paper are to understand the overall process and triggering factors of this landslide and to explore the affecting factors for its long term evolution before failure. Post event surveys were carried out the day after the landslide occurrence. Information was gathered from literature and on-site investigation and measurement. Topography, landforms, lithology, geological setting, earthquake history, meteorological and hydrological data of the area were analysed. Aerial photographs and other remote sensing information were used for evaluation and discussion. Eye witnesses also provided a lot of helpful information for us to understand the process of initiation, development and deposition. The depositional characteristics of the moving material as well as the traces of the movement, the structural features of the main scarp and the seismic waves induced by the slide are presented and discussed in detail in this paper. The results show that the mechanism of the landslide is a sudden rupture of the main block caused by the instability of a secondary block at a higher position. After the initiation, the failed rock mass at higher position overloaded the main block at the lower elevation and collapsed in tandem. Fragmentation of the rock mass occurred later, thus forming a debris avalanche with high mobility. This landslide case indicates that such seismic events could influence geological hazards for over 80 years and this study provides reference to the long term susceptibility and risk assessment of secondary geological hazards from earthquake.
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Reprint Address:Cui, P (corresponding author), Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Sichuan, Peoples R China.; Cui, P (corresponding author), Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Sichuan, Peoples R China.; Cui, P (corresponding author), CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China.; Cui, P (corresponding author), Univ Chinese Acad Sci, Beijing 100049, Peoples R China.
Addresses:[Su, Li-jun; Hu, Kai-heng; Zhang, Wei-feng; Wang, Jiao; Lei, Yu; Zhang, Chong-lei; Cui, Peng] Chinese Acad Sci, Key Lab Mt Hazards & Earth Surface Proc, Chengdu 610041, Sichuan, Peoples R China. [Su, Li-jun; Hu, Kai-heng; Zhang, Wei-feng; Wang, Jiao; Lei, Yu; Zhang, Chong-lei; Cui, Peng] Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Sichuan, Peoples R China. [Su, Li-jun; Cui, Peng] CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China. [Su, Li-jun; Wang, Jiao; Lei, Yu; Cui, Peng] Univ Chinese Acad Sci, Beijing 100049, Peoples R China. [Pasuto, Alessandro] Sino Italian Lab Geol & Hydrol Hazards, Chengdu 610041, Sichuan, Peoples R China. [Pasuto, Alessandro] Natl Res Council Italy, Res Inst Geohydrol Protect, Padua, Italy. [Zheng, Quan-hong] Sichuan Bur Surveying Mapping & Geoinformat, Chengdu 610041, Sichuan, Peoples R China.
E-mail Addresses:sulijun1976@163.com; khhu@imde.ac.cn; zwf@imde.ac.cn; jxwwj2015@163.com; leiyu@imde.ac.cn; chongleizhang2010@163.com; pengcui@imde.ac.cn; alessandro.pasuto@irpi.cnr.it; qhong21@qq.com