九寨沟M_S7.0地震对巴颜喀拉块体东北缘活动断裂影响的有限元模拟  

Impact of the Jiuzhaigou M_S7.0 earthquake on the activity faults around the northeastern Bayan Har block: Insights from finite element simulation

作　　者：石富强[1] 朱琳[1] 王莹[1] 丁晓光[1] 邱玉荣[1] 石军[1] Shi Fuqiang;Zhu Lin;Wang Ying;Ding Xiaoguang;Qiu Yurong;Shi Jun(Shaanxi Earthquake Agency,Xi＇an 710068,China)

机构地区：[1]陕西省地震局,西安市碑林区水文巷4号710068

出　　处：《中国地震》2017年第4期463-470,共8页Earthquake Research in China

基　　金：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);国家留学基金委项目(201604190009)共同资助

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M_S7.0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。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.

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 

分 类 号：P315[天文地球—地震学]