大地测量与地球动力学2018，Vol.38Issue(4)：338-343,6.DOI:10.14075/j.jgg.2018.04.002
2010年玉树地震库仑应力变化对2016年杂多地震的影响及区域危险性评估
Coulomb Stress Influence of 2010 Yushu Earthquake on 2016 Zaduo Earthquake:Earthquake and Seismic Hazard Assessment on Surrounding Area
摘要
Abstract
Based on elastic dislocation theory and lithosphere layered viscoelastic model,we analyze the influence of the co-seismic and post-seismic stress of the Yushu earthquake on the Zaduo earthquake.Additionally,we discuss the stress influence of Yushu and Zaduo earthquakes on the major active faults about seismic risk in the study area.The result shows that the co-seismic stress increased 1.476 kPa on the epicenter of the 2016 Zaduo earthquake.During the 6 years between the two earthquakes,post-seismic Coulomb stress enhanced regional stress in the area,and released stress in the stress shadow;the epicenter of the Zaduo earthquake is always located in the area of enhanced stress.When the Zaduo earthquake occurred,the Coulomb stress increased 3.902 kPa on the epicenter of the Zaduo earthquake.The results of different models show that the occurrence of Yushu earthquake promoted the occurrence of Zaduo earthquake.The co-seismic rupture of Zaduo earthquake only affected the stress state of a small area around the epicenter,which made a high stress area in the northwest of Zaduo fault zone.The co-seismic and post-seismic effect of Yushu earthquake significantly enhanced the stress state of the Yenuoka-Jielong segment,Batang-Luoxu segment,Dangjiang segment,the middle segments of Batangxiang and Wudaoliang-Qumalai faults.The northwest seismic gaps of Ganzi-Yushu fault,including the Yenuoka-Jielong and Batang-Xianggu segments,retain arelatively high seismic hazard.关键词
甘孜-玉树断裂/玉树地震/库仑应力/粘弹性松弛/地震危险性Key words
Ganzi-Yushu fault/Yushu earthquake/Coulomb stress/viscoelastic relaxation/seismic hazard分类
天文与地球科学引用本文复制引用
熊维,喻成,陈威,聂兆生,谭凯..2010年玉树地震库仑应力变化对2016年杂多地震的影响及区域危险性评估[J].大地测量与地球动力学,2018,38(4):338-343,6.基金项目
国家自然科学基金(41604079,41274027,41504011,41574017,41541029) （41604079,41274027,41504011,41574017,41541029）
中国地震局地震研究所所长基金(IS201456148,IS201506220).National Natural Science Foundation of China,No.41604079,41274027,41504011,41574017,41541029 （IS201456148,IS201506220）
Director Fund of Institute of Seismology,CEA,No.IS201456148,IS201506220. （）
