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九寨沟MS7.0地震对巴颜喀拉块体东北缘活动断裂影响的有限元模拟
石富强,朱琳,王莹,丁晓光,邱玉荣,石军
作者单位E-mail
石富强 陕西省地震局, 西安市碑林区水文巷4号 710068  
朱琳 陕西省地震局, 西安市碑林区水文巷4号 710068 arlene881115@sina.com 
王莹 陕西省地震局, 西安市碑林区水文巷4号 710068  
丁晓光 陕西省地震局, 西安市碑林区水文巷4号 710068  
邱玉荣 陕西省地震局, 西安市碑林区水文巷4号 710068  
石军 陕西省地震局, 西安市碑林区水文巷4号 710068  
摘要:
在详细调研地震地质资料的基础上,构建了巴颜喀拉地块东北缘三维有限元模型。以九寨沟MS7.0地震同震位错为荷载,模拟计算了九寨沟地震的发生对巴颜喀拉块体东北缘主要活动断裂加卸载效应的影响。模拟结果显示,九寨沟地震的发生对龙日坝断裂、虎牙断裂、青川-平武断裂西段、迭部-白龙江断裂西段和东段、临潭-宕昌断裂东段,以及处于甘青川交界危险区内的东昆仑断裂东段、塔藏断裂西段,处于六盘山南-西秦岭东危险区的西秦岭北缘断裂东段表现为库仑应力加载;对岷江断裂、塔藏断裂东段库仑应力卸载效应显著。
关键词:  九寨沟MS7.0地震  库仑应力  巴颜喀拉块体东北缘  有限元模拟
DOI:
分类号:P315
基金项目:中国地震局地震科技星火计划(XH17034Y)、中国地震局震情跟踪合同制任务(2017010114)以及国家留学基金委项目(201604190009)共同资助
Impact of the Jiuzhaigou MS7.0 earthquake on the activity faults around the northeastern Bayan Har block: Insights from finite element simulation
Shi Fuqiang,Zhu Lin,Wang Ying,Ding Xiaoguang,Qiu Yurong,Shi Jun
Abstract:
Based on the investigation of the geology literature, we built a 3-D finite element model of the northeastern Bayan Har block. With the model by the coseismic dislocation, the loading or unloading effects of the Jiuzhaigou earthquake on the activity faults around the northeastern Bayan Har block is simulated in this paper. The results show that impacted by the Jiuzhaigou earthquake, the Coulomb stress increased significantly on the west segment of Tazang Fault and Huya Fault and decreased on the Minjiang fault and the east segment of Tazang Fault. There are also some degrees of Coulomb stress loading on the east segment of Dongkunlun Fault, the Longriba fault, the west segment of Pingwu-Qingchuan fault, the west and east segment of Diebu-Bailongjiang fault, the east segment of Lintan-Tanchang fault and the east segment of Xiqinling Fault.
Key words:  Jiuzhaigou MS7.0 earthquake  Coulomb stress  Northeastern Bayan Har block  Finite element simulation