Journal
LANDSLIDES
Volume 15, Issue 12, Pages 2465-2474Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10346-018-1073-2
Keywords
Xinmo landslide; Triggering mechanism; Rockfall-debris avalanche
Funding
- National Key R&D Program of China [2016YFB0201003]
- National Natural Science Foundation of China [41790434]
- External Cooperation Program of BIC, Chinese Academy of Sciences [131551KYSB20130003]
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On June 24, 2017 (21:39 UTC, June 23rd), a catastrophic landslide occurred at Xinmo village of Mao County, Sichuan Province, China. Soon after the event, some research teams carried out field investigations in order to both support the emergency operations and to understand the failure mechanism and possible evolutionary scenarios. Based on further in-depth interpretation of high-resolution remote-sensing images and detailed field surveys, it is newly found that there are at least six old rockfall deposits in the source area that prove the historic activity of the landslide scarp. Seismic data of the event and morphological evidences along the slope indicate that the landslide was preceded by a significant rockfall. Mechanical calculations show that the surface force due to pore water was far less than the impact force due to the rockfall. It means that the subsequent major rock avalanche was more likely due to the impact of the rockfall on the rock slope below, which broke the rock bridges and caused drop of shear resistance along the fractures. According to these new understandings, a different triggering mechanism for the landslide is proposed.
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