The Stress State of the Beichuan-Jiangyou Segment of the Longmenshan Fault before and after the Wenchuan M-S 8.0 Earthquake

doi:10.1007/s12583-014-0473-z

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

	The Stress State of the Beichuan-Jiangyou Segment of the Longmenshan Fault before and after the Wenchuan M-S 8.0 Earthquake
	Feng, Chengjun 2; Chen, Qunce ; Tan, Chengxuan ; Qin, Xianghui s ; Zhang, Peng ; Meng, Wen
刊名	JOURNAL OF EARTH SCIENCE
	2014
卷号	25 期号:5 页码:861-870
关键词	Longmenshan fault belt hydraulic fracturing situ stress co-seismic stress numerical simulation
ISSN号	1674-487X
DOI	10.1007/s12583-014-0473-z
英文摘要	After the Wenchuan M-S 8.0 Earthquake, which occurred on May 12, 2008, in Sichuan Province, China, we conducted a series of hydraulic fracturing stress measurements in three 200 m deep boreholes (ZK01, ZK02, and ZK03) drilled in Beichuan and Jiangyou regions near the northeastern segment of Longmenshan fault belt in 2009. These measurements revealed the near-surface stress field in the fault region one year after the Wenchuan Ms 8.0 Earthquake. However, the lack of the stress measurements before the earthquake in the same region makes it difficult to understand variations of the in situ stress field (near-surface) by comparative analysis. In order to determine the unknown horizontal principal stresses before the earthquake in Beichuan and Jiangyou regions, the following research method was tentatively applied. Firstly, we calculate the static co-seismic stress field by linear elastic finite element numerical simulation with ANSYS, based on the co-seismic static displacement generated by the Wenchuan M-S 8.0 Earthquake along the central Longmenshan fault plane in Beichuan and Jiangyou. Secondly, combining hydraulic fracturing measurements (after the earthquake) with the co-seismic stress (simulation), the magnitudes and orientations of horizontal principal stresses before the earthquake were calculated. Finally, the variation of the in situ stress (near-surface) in Beichuan and Jinagyou, both before and after the Wenchuan M-S 8.0 Earthquake, were obtained by comparative analysis. To do this the magnitude of S-Hmax was decreased on average by 13.01 and 6.54 MPa after the earthquake in ZK02 and ZK03, respectively and the magnitude of S-Hmin was decreased by 2.54 and 5.29 MPa in ZK02 and ZKO3, respectively. Following the earthquake, the average direction of S-Hmax rotated anticlockwise by 42.5 degrees.
学科主题	固体地球物理学
WOS关键词	RUPTURE ; CHINA
WOS研究方向	Geology
语种	英语
出版者	CHINA UNIV GEOSCIENCES
WOS记录号	WOS:000342966400007
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/41038]
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 Geomech, Beijing 100081, Peoples R China; Minist Land & Resources, Key Lab Neotecton Movement & Geohazard, Beijing 100081, Peoples R China 2.中国地质科学院地质力学研究所
推荐引用方式 GB/T 7714	Feng, Chengjun,Chen, Qunce,Tan, Chengxuan,et al. The Stress State of the Beichuan-Jiangyou Segment of the Longmenshan Fault before and after the Wenchuan M-S 8.0 Earthquake[J]. JOURNAL OF EARTH SCIENCE,2014,25(5):861-870.
APA	Feng, Chengjun,Chen, Qunce,Tan, Chengxuan,Qin, Xianghui s,Zhang, Peng,&Meng, Wen.(2014).The Stress State of the Beichuan-Jiangyou Segment of the Longmenshan Fault before and after the Wenchuan M-S 8.0 Earthquake.JOURNAL OF EARTH SCIENCE,25(5),861-870.
MLA	Feng, Chengjun,et al."The Stress State of the Beichuan-Jiangyou Segment of the Longmenshan Fault before and after the Wenchuan M-S 8.0 Earthquake".JOURNAL OF EARTH SCIENCE 25.5(2014):861-870.