气候变化领域集成服务门户(CCPortal): 3D Finite-Element Modeling of Earthquake Interaction and Stress Accumulation on Main Active Faults around the Northeastern Tibetan Plateau Edge in the Past similar to 100 Years

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DOI	10.1785/0120140342
	3D Finite-Element Modeling of Earthquake Interaction and Stress Accumulation on Main Active Faults around the Northeastern Tibetan Plateau Edge in the Past similar to 100 Years
	Xiao, Jie; He, Jiankun
通讯作者	Xiao, J (通讯作者)
发表日期	2015
ISSN	0037-1106
EISSN	1943-3573
起始页码	2724
结束页码	2735
卷号	105 期号:5
英文摘要	The northeastern Tibetan plateau edge is an active tectonic region with crustal deformation featured mainly by thrust and strike-slip faults. In the past similar to 100 years, several strong earthquakes have occurred around this region. Associated with regional tectonic loading, these strong earthquakes altered the stress buildup of active faults; this in turn should affect the potential hazard of seismicity around the northeastern Tibetan plateau. Here, we developed a 3D viscoelastic finite-element model to explore the stress accumulation along the main active faults during the past similar to 100 years. In this model, rheological contrast of the crust and upper mantle between the Tibetan plateau and its surrounding regions is approximated, and regional tectonic loading is simplified from dense Global Positioning System measurements. Results show that after the 1920 M similar to 8.7 Haiyuan earthquake, the succeeding ruptures, both of thrusting and strike-slipping events, had received positive changes of Coulomb failure stress-among which the coseismic and the postseismic deformations from previous earthquake(s) contributed 36%-80%. This means that significant mechanical interactions existed between the active faults around northeastern Tibet during the earthquake process even though they were separated by hundreds of kilometers. Numerical results also suggest that the 1954 M similar to 7.2 Shandan earthquake and the 1990 M similar to 6.2 Tianzhu earthquake could have been triggered because the Coulomb failure stress received from coseismic and postseismic deformation of previous earthquakes around the epicenter of these two events reached similar to 0.02-0.3 MPa. After about 100 years of regional tectonic loading-coseismic and postseismic deformations of past large earthquakes-the Coulomb failure stress along the northeastern segment of the Altyn Tagh fault, the Tianzhu segment of the Haiyuan fault, and the Gulang fault has accumulated to 0.005-0.2 MPa. Therefore, as previous studies mentioned for the Tianzhu seismic gap, these active faults should be carefully studied because of their potential earthquake hazard.
关键词	WESTERN HAIYUAN FAULT QILIAN-SHAN SLIP RATE SOUTHERN CALIFORNIA AUTONOMOUS REGION GANSU PROVINCE STATIC STRESS EVOLUTION CHINA DEFORMATION
语种	英语
WOS研究方向	Geochemistry & Geophysics
WOS类目	Geochemistry & Geophysics
WOS记录号	WOS:000362122600029
来源期刊	BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258424
推荐引用方式 GB/T 7714	Xiao, Jie,He, Jiankun. 3D Finite-Element Modeling of Earthquake Interaction and Stress Accumulation on Main Active Faults around the Northeastern Tibetan Plateau Edge in the Past similar to 100 Years[J]. 中国科学院青藏高原研究所,2015,105(5).
APA	Xiao, Jie,&He, Jiankun.(2015).3D Finite-Element Modeling of Earthquake Interaction and Stress Accumulation on Main Active Faults around the Northeastern Tibetan Plateau Edge in the Past similar to 100 Years.BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA,105(5).
MLA	Xiao, Jie,et al."3D Finite-Element Modeling of Earthquake Interaction and Stress Accumulation on Main Active Faults around the Northeastern Tibetan Plateau Edge in the Past similar to 100 Years".BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA 105.5(2015).