东安纳托利亚断裂带近期库仑应力演化及与2020年埃拉泽M_(W)6.8地震的触发关系  

Recent Coulomb Stress Evolution in the East Anatolian Fault Zone and Its Triggering Relationship with the 2020 Elaz M_(W)6.8 Earthquake

作　　者：王茗册 何仲秋 陈庭 WANG Mingce;HE Zhongqiu;CHEN Ting(School of Geodesy and Geomatics,Wuhan University,129 Luoyu Road,Wuhan 430079,China;College of Science,Southern University of Science and Technology,1088 Xueyuan Road,Shenzhen 518055,China;Key Laboratory of Geospace Environment and Geodesy,Ministry of Education,Wuhan University,129 Luoyu Road,Wuhan 430079,China)

机构地区：[1]武汉大学测绘学院,武汉市430079 [2]南方科技大学理学院,深圳市518055 [3]武汉大学地球空间环境与大地测量教育部重点实验室,武汉市430079

出　　处：《大地测量与地球动力学》2022年第5期526-532,共7页Journal of Geodesy and Geodynamics

基　　金：国家重点研发计划(2016YFC1401506,2018YFC1503605)。

摘　　要：基于地球分层介质模型,同时考虑同震位错、震后粘滞松弛效应和震间构造加载的作用,计算东安纳托利亚断裂带附近1822年以来大于6级的历史强震产生的同震和震后库仑应力变化以及6个断层段震间构造应力积累。结果表明,共14次强震的同震应力扰动对2020年埃拉泽M_(W)6.8地震的发生有促进作用,1875年M6.7地震的同震应力卸载作用使得整体同震应力扰动对埃拉泽M_(W)6.8地震的触发影响不明显;震后粘弹性应力扰动以及断层震间构造应力加载在埃拉泽M_(W)6.8地震震源处造成较大的应力积累,对其有显著的触发作用;Turkoglu、Lake Hazar和Yedisu段库仑应力积累较多,未来地震活动危险性较高。Based on the stratified medium model of crust and upper mantle,this study calculates the coseismic and postseismic Coulomb stress changes generated by historical M>6 earthquakes since 1822 and the interseismic stress accumulation in six fault segments near the east Anatolian fault zone by combining coseismic deformation,viscoelastic relaxation and tectonic loading effects.The results show that the overall coseismic stress change is insignificant in triggering the 2020 Elaz M_(W)6.8 earthquake because of stress unloading from the 1875 M6.7 earthquake,even though 14 events contribute to the occurrence of the Elaz M_(W)6.8 earthquake.Postseismic and interseismic Coulomb stress changes play important roles in triggering the Elaz M_(W)6.8 earthquake.The high Coulomb stress accumulations in the Turkoglu,Lake Hazar,and Yedisu segments indicate the future seismic hazard on these zone needs more attention.

关 键 词：东安纳托利亚断裂带 库仑应力演化 应力触发 2020年埃拉泽M_(W)6.8地震 地震危险性 

分 类 号：P313[天文地球—固体地球物理学] P315[天文地球—地球物理学]