Determination of three-dimensional in situ stresses by anelastic strain recovery in Wenchuan Earthquake Fault Scientific Drilling Project Hole-1 (WFSD-1)

doi:10.1016/j.tecto.2013.09.013

CORC > 中国地质调查局 > 中国地质调查局 > 中国地质科学院地质力学研究所

	Determination of three-dimensional in situ stresses by anelastic strain recovery in Wenchuan Earthquake Fault Scientific Drilling Project Hole-1 (WFSD-1)
	Cui, Junwen 8; Lin, Weiren 1; Wang, Lianjie 2; Gao, Lu 3; Huang, Yao 4; Wang, Wei 2; Sun, Dongsheng 2; Li, Zongfan 6; Zhou, Chunjing 2; Qian, Huashan 5
刊名	TECTONOPHYSICS
	2014
卷号	619 页码:123-132
关键词	Wenchuan Earthquake Fault Anelastic strain recovery Three dimensional stress measurement Longmenshan Thrusting Dextral strike-slip faulting
ISSN号	0040-1951
DOI	10.1016/j.tecto.2013.09.013
英文摘要	The Wenchuan Earthquake Fault Scientific Drilling Project was implemented rapidly after the great 12 May 2008 earthquake (Mw 7.9) to better understand rupture mechanisms of the seismic faults. The first borehole of the project WFSD-1 was located in Hongkou Township, Dujiangyan City, Sichuan Province, China on the hanging wall of the Yingxiu-Beichuan fault, which underwent large dextral and vertical displacement during the earthquake. The near-vertical borehole was 1201 m long. In-situ stresses were measured in rock samples from depths between 424 and 1173 m drilling depth by the anelastic strain recovery (ASR) method. The average trend of the maximum principal stress sigma(1) was N309 degrees (ranging from N291 degrees to N325 degrees), rotated with increasing borehole depth from NW-SE to WNW-ESE. The magnitude of the in-situ maximum principal stress was estimated to be 353 MPa at the depth of 1173 m. The relations between horizontal and vertical stresses are vertical stress sigma(v) > maximum horizontal stress sigma(H) > minimum horizontal stress sigma(h) at depths above 424 m, sigma(H) > sigma(h) > sigma(v) at depths from 424 m to 800 m, and sigma(H) > sigma(v), > sigma(h) below the depth of 800 m. These indicate that the stress states are in a normal faulting stress regime above 424 m; a reverse faulting regime from 424 m to 800 m and a dextral strike-slip regime below 800 m. The stress measurements from WFSD-1 are consistent with the focal mechanism solution in which the mainshock was dominated by thrusting accompanied by dextral strike-slip motion. The orientations of sigma(1) are roughly consistent with the tectonic displacement direction of the Longmenshan area, which provides further evidence of NW-SE movements representing compression of the Songpan-Ganzi block toward the Sichuan basin. 2013 Elsevier B.V. All rights reserved.
学科主题	固体地球物理学
WOS关键词	KEN NANBU-EARTHQUAKE ; LONGMEN SHAN ; WELLBORE BREAKOUTS ; TECTONIC STRESS ; INSITU STRESS ; ZONE ; CHINA ; SLIP ; BOREHOLE ; PLATEAU
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000335284900013
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/40559]
专题	中国地质科学院地质力学研究所
作者单位	1.Chinese Acad Geol Sci, Inst Geol, State Key Lab Continental Tecton & Dynam, Beijing 100037, Peoples R China 2.Japan Agcy Marine Earth Sci & Technol JAMSTEC, Kochi Inst Core Sample Res, Nankoku, Kochi 7838502, Japan 3.Chinese Acad Geol Sci, Inst Geomech, Beijing 100081, Peoples R China 4.China Univ Geosci, Beijing 100081, Peoples R China 5.6 Brigade Jiangsu Geol & Mineral Resources Bur, Lianyungang 222300, Jiangsu, Peoples R China 6.Beijing Supcompute Com, Beijing 100083, Peoples R China 7.Reg Geol Survey Party Sichuan Prov, Chengdu 610213, Jiangsu, Peoples R China 8.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Cui, Junwen,Lin, Weiren,Wang, Lianjie,et al. Determination of three-dimensional in situ stresses by anelastic strain recovery in Wenchuan Earthquake Fault Scientific Drilling Project Hole-1 (WFSD-1)[J]. TECTONOPHYSICS,2014,619:123-132.
APA	Cui, Junwen.,Lin, Weiren.,Wang, Lianjie.,Gao, Lu.,Huang, Yao.,...&Li, Ke.(2014).Determination of three-dimensional in situ stresses by anelastic strain recovery in Wenchuan Earthquake Fault Scientific Drilling Project Hole-1 (WFSD-1).TECTONOPHYSICS,619,123-132.
MLA	Cui, Junwen,et al."Determination of three-dimensional in situ stresses by anelastic strain recovery in Wenchuan Earthquake Fault Scientific Drilling Project Hole-1 (WFSD-1)".TECTONOPHYSICS 619(2014):123-132.