地震学报2018，Vol.40Issue(3)：291-303,13.DOI:10.11939/jass.20170201
基于库仑应力改变和地震活动性研究巴颜喀拉块体周缘强震序列的触发关系及其构造意义
Triggering relationship in strong earthquake sequence around the Bayan Har block and its tectonic significance based on Coulomb stress changes and seismicity
摘要
Abstract
Seven major earthquakes of Mw≥6.5 have occurred around the Bayan Har block in the Tibetan Plateau since this century,including the devastated 2008 Wenchuan earthquake and the recent 2017 Jiuzhaigou earthquake.Here we investigate the triggering effects among those major earthquakes by calculating the Coulomb stress changes and analyzing the background seismicity rate changes,and furthermore to understand the tectonic activity of the Bayan Har block.Our results show that,the Coulomb stress changes positively correlate with the background seismicity rate changes.Also,the results show that the Wenchuan earthquake triggered the Lushan earthquake and delayed the Jiuzhaigou earthquake.Besides,there is no significant triggering/delay effect among other major earthquakes.These findings imply that the remarkable earthquake sequence results from the southeastward movement of the Bayan Har block,and the Bayan Har block is still in the highly active seismic period.Furthermore,the seismic hazards of the Bayan Har block and its adjacent faults in the southwestern China should be paid more attention.关键词
汶川地震/巴颜喀拉块体/ETAS模型/库仑应力改变/强震相互作用Key words
Wenchuan earthquake/Bayan Har block/ETAS model/Coulomb stress change/stress interaction among earthquakes引用本文复制引用
贾科,周仕勇..基于库仑应力改变和地震活动性研究巴颜喀拉块体周缘强震序列的触发关系及其构造意义[J].地震学报,2018,40(3):291-303,13.基金项目
中央高校基本科研业务费专项资金(3102017OQD024)、航天科学技术基金(2017-HT-XG)和国家自然科学基金(41274052,41474033)联合资助. （3102017OQD024）
