Coseismic Coulomb failure stress changes caused by the 2017 M7.0 Jiuzhaigou earthquake, and its relationship with the 2008 Wenchuan earthquake

On August 8, 2017, a M 7.0 earthquake occurred in Jiuzhaigou County, Sichuan Province, China, resulting in significant casualties and property damage. Therefore, it is critical to identify the areas of potential aftershocks before reconstruction and re-settling people to avoid future disasters. Base...

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Bibliographic Details
Published in:Science China. Earth sciences 2017-12, Vol.60 (12), p.2181-2189
Main Authors: Shan, Bin, Zheng, Yong, Liu, ChengLi, Xie, ZuJun, Kong, Jun
Format: Article
Language:English
Subjects:
Accumulation
Aftershocks
Casualties
Damage detection
Disasters
Dislocations
Distribution
Earth and Environmental Science
Earth Sciences
Earthquake damage
Earthquakes
Failure
Faults
Geological hazards
Multilayers
Property damage
Researcr Paper
Seismic activity
Seismic hazard
Stress analysis
Stress concentration
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Summary:On August 8, 2017, a M 7.0 earthquake occurred in Jiuzhaigou County, Sichuan Province, China, resulting in significant casualties and property damage. Therefore, it is critical to identify the areas of potential aftershocks before reconstruction and re-settling people to avoid future disasters. Based on the elastic dislocation theory and a multi-layered lithospheric model, we calculate the Coulomb failure stress changes caused by the Wenchuan and Jiuzhaigou earthquakes, discuss the relationship between the M w 7.9 Wenchuan and M 7.0 Jiuzhaigou earthquakes, and analyze the influence of the aftershock distribution and stress changes on the major faults in this region caused by the Jiuzhaigou earthquake. The co- and post-seismic stress changes caused by the Wenchuan earthquake significantly increased the stress accumulation at the hypocenter of the Jiuzhaigou earthquake. Therefore, the occurrence of the Jiuzhaigou earthquake was probably stimulated by the Wenchuan earthquake. The aftershock distribution is well explained by the co-seismic stress changes of the Jiuzhaigou earthquake. The stress accumulation and corresponding seismic hazard on the Maqu-Heye segment of the East Kunlun fault and the northern extremity of the Huya fault has been further increased by the Jiuzhaigou earthquake.
ISSN:1674-7313
1869-1897
DOI:10.1007/s11430-017-9125-2