The Seismic Probability of the Faults in Boundary Area of Gansu and Qinghai Provinces Influenced by the 2008 Wenchuan Mw7.9 Earthquake and the 2017 Jiuzhaigou Mw6.5 Earthquake
Session: New Insights Into the Preparatory Phase of Earthquakes From Tectonic, Field and Lab Experiments [Poster]
Type: Poster
Date: 4/19/2021
Presentation Time: 03:45 PM Pacific
Description:
On August 8, 2017, an earthquake with MW6.5 occurred in Jiuzhaigou, Sichuan Province, causing heavy casualties and property losses. After that, many studies concerned the stress effects on different faults in surrounding areas by the Jiuzhaigou earthquake (Shan et al, 2017; Xu et al, 2017; Wang et al, 2017; Cheng et al, 2018). Previous research mostly focused on the stress influence on faults by the 2008 Wenchuan MW7.9 earthquake and the 2017 Jiuzhaigou MW6.5 earthquake. In this paper, based on the rate- and state-dependent friction law (Dieterich, 1994) , combined with background seismicity and the Coulomb stress disturbance caused by both the two earthquakes, the seismic probabilities of the loaded faults were quantitatively calculated. The distribution of Coulomb stress show that the faults been loaded includes the northern part of Pingwu-Qingchuan fault, the western part of Tazang fault, the Kangxian fault, the southern part of Minjiang fault, the middle and western part of Liangdangjiangluo fault, the eastern part of Xueshan fault, the Maqu fault, the Maqin fault, and the eastern part of Lintan-Dangchang fault, the western segment of Guanggaishan fault, the western segment of Bailongjiang fault and the western segment of Wenxian fault. The calculated results of the seismic probabilities of the loaded faults show that the areas nearby the southern part of Minjiang fault, the western part of Tazang fault, the western segment of Guanggaishan fault, the western segment of Bailongjiang fault, the eastern part of Lintan-Dangchang fault, the western segment of Wenxian fault have high probability of strong earthquake and seismic hazard.
This study was supported by the National Key R&D Program of China (2018YFC1503305).
Presenting Author: Jin Song
Student Presenter: No
Authors
Jin Song Presenting Author songjinbent@seis.ac.cn China Earthquake Network Center |
Lingyuan Meng Corresponding Author menglingyuan@seis.ac.cn China Earthquake Network Center |
Haikun Jiang jianghaikun@seis.ac.cn China Earthquake Network Center |
Yanyan Han hanyy@seis.ac.cn China Earthquake Network Center |
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The Seismic Probability of the Faults in Boundary Area of Gansu and Qinghai Provinces Influenced by the 2008 Wenchuan Mw7.9 Earthquake and the 2017 Jiuzhaigou Mw6.5 Earthquake
Category
New Insights Into the Preparatory Phase of Earthquakes From Tectonic, Field and Lab Experiments