Journal
JOURNAL OF MOUNTAIN SCIENCE
Volume 15, Issue 4, Pages 793-807Publisher
SCIENCE PRESS
DOI: 10.1007/s11629-017-4761-9
Keywords
2017 Jiuzhaigou earthquake; Landslide; Seismogenic fault; Topography; Spatial pattern
Categories
Funding
- Key Laboratory Program for Mountain Hazards and Earth Surface Process, CAS [KLMHESP-17-06]
- International Science Program-Silk Road Disaster Risk Reduction Grant [131551KYSB20160002]
- Major International (Regional) Joint Research Project [41520104002]
- Key Research Program of Frontier Sciences, CAS [QYZDY-SSW-DQC006]
- 135 Strategic Program of the Institute of Mountain Hazards and Environment, CAS [SDS-135-1701]
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Jiuzhaigou National Park, located in northwest plateau of Sichuan Province, is a UNESCO World Heritage Site, and one of the most popular scenic areas in China. On August 8, 2017, a Mw 6.5 earthquake occurred 5 km to the west of a major scenic area, causing 25 deaths and injuring 525, and the Park was seriously affected. The objective of this study was to explore the controls of seismogenic fault and topographic factors on the spatial patterns of these landslides. Immediately after the main shock, field survey, remote-sensing investigations, and statistical and spatial analysis were undertaken. At least 2212 earthquake-triggered landslides were identified, covering a total area of 11.8 km2. These were mainly shallow landslides and rock falls. Results demonstrated that landslides exhibited a close spatial correlation with seismogenic faults. More than 85% of the landslides occurred at 2200 to 3700 m elevations. The largest quantity of landslides was recorded in places with local topographic reliefs ranging from 200 to 500 m. Slopes in the range of similar to 20A degrees-50A degrees are the most susceptible to failure. Landslides occurred mostly on slopes facing east-northeast (ENE), east (E), east-southeast (ESE), and southeast (SE), which were nearly vertical to the orientation of the seismogenic fault slip. The back-slope direction and thin ridge amplification effects were documented. These results provide insights on the control of the spatial pattern of earthquake-triggered landslides modified by the synergetic effect of seismogenic faults and topography.
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