Abstract
At 21.19 on 8 August 2017, an Ms 7.0 earthquake struck the Jiuzhaigou scenic spot in northwestern Sichuan Province, China. The Jiuzhaigou earthquake is a strike-slip earthquake with a focal depth of 20 km at 33.20° N and 103.82° E, and was caused by two concealed faults. According to emergency investigations and remote sensing interpretations, the Jiuzhaigou earthquake triggered 1780 landslides, damaged one dam (Nuorilang Waterfall) and broke one dam (Huohua Lake). The landslides mainly occurred in the Rize Valley and Shuzheng Valley and in Jiuzhai Paradise. The landslides involved hanging wall and back-slope effects, and the slope angle, slope aspect, seismic faults and valley trend were obviously related to the occurrence of the landslides. Specifically, most of the landslides were shallow landslides, rockfalls and rock avalanches and were small in scale. The failure modes of landslides mainly include wedge rock mass failure, residual deposit failure, relaxed rock mass failure and weathered rock mass failure. The initial low stability of the dam coupled with the topographic effect, back-slope effect and excess pore water pressure led to damage to the Nuorilang Waterfall dam.
Highlights
The Jiuzhaigou earthquake occurred at 21.19 local time (13.19 UTC) on 8 August 2017, at the Jiuzhaigou scenic spot in Sichuan Province, China
Our study focuses on the characterization of the distribution and nature of landslides induced by the Jiuzhaigou earthquake and makes a comparison of these data with previous observations made during the 2008 Wenchuan Ms 8.0 earthquake and 2013 Lushan Ms 7.0 earthquake
The epicentre is located in the Jiuzhaigou scenic spot
Summary
The Jiuzhaigou earthquake occurred at 21.19 local time (13.19 UTC) on 8 August 2017, at the Jiuzhaigou scenic spot in Sichuan Province, China. This earthquake had a magnitude of Ms 7.0 and a focal depth of 20 km at 33.20° N and 103.82° E [1]. By 20.00 on 13 August 2017, the Jiuzhaigou earthquake had resulted in 25 fatalities, 525 injured persons, 76 671 damaged rooms and a total estimated economic loss of more than 140 million RMB [2]. The earthquake triggered various types of geohazards, including landslides, dam break and dam damage
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