Evolution of Coulomb Stress and Stress Interaction among Strong Earthquakes along the Xianshuihe Fault Zone
详细信息
- 责任者：Xu Jing (Institute of Earthquake Science ; China Earthquake Administration ; Beijing 100036 ; China) ; Shao Zhigang
- 刊名：Chinese Journal of Geophysics
- 出版年：2013
- 卷期：56(4)
- 关键词：断裂带 ; fracture zones ; 地震活动性 ; seismicity ; 鲜水河断裂带 ; Xianshuihe Fault Zone
- 页码：p.1146-1158
- 图表：illus., 4 tables, 40 refs.
- 分类号：0500
- issnNo：ISSN0001-5733
- isbnNo：CN11-2074/P
摘要
Taking Xianshuihe fault zone as the study area,initially,we verified the Coulomb stress triggering of earthquakes with M≥6.7 along the fault zone since 1893,then using a more realistic model of multi-layered viscoelastic media,we calculated the Coulomb stress changes caused by viscoelastic relaxation of previous strong earthquake.In addition,we calculated inter-seismic stress accumulation caused by the tectonic loading generated by plate motions,the inter-seismic stress accumulation is modeled by introducing "virtual negative displacements" along 10 major faults segments in the region under study.On this basis,we further discussed the Coulomb stress accumulation caused by the co-seismic,post-seismic,and inter-seismic effect and its relationship with the regional seismic activity,and then simulated the evolution of Coulomb failure stress changes with time along the fault.The result shows that the occurrence of all of seven strong events on Xianshuihe fault since 1893 was driven by a series of previous strong earthquakes and tectonic stress loading,and co-seismic dislocation,viscoelastic relaxation and inter-seismic tectonic loading significantly affect the stress state on the fault.The study of the Coulomb stress changes along the fault zone can provide clues to reveal the law of earthquakes occurrence and find the fault segment at risk.
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