Relationship between characteristics of gravity and magnetic anomalies and the earthquakes in Longmenshan range and adjacent areas

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	Relationship between characteristics of gravity and magnetic anomalies and the earthquakes in Longmenshan range and adjacent areas
	Zhang, JS (Zhang Ji-Sheng)9; Gao, R (Gao Rui); Zeng, LS (Zeng Ling-Sen); Ll, QS (Ll Qiu-Sheng); Guan, Y (Guan Ye); He, RZ (He Ri-Zheng); Wang, HY (Wang Hai-Yan); Li, ZW (Li Zhan-Wu)
刊名	CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
	2009
卷号	52 期号:2 页码:572-578
关键词	Longmenshan fault zone Wenchuan earthquake Gravity anomaly Gravity gradient belt Magnetic anomaly Lithosphere block
ISSN号	0001-5733
英文摘要	The gravity gradient belt in the Longmenshan fault zone is part of the great gravity gradient belt surrounding the Tibetan plateau in the north and the east. The density boundary plane, corresponding to the gravity gradient belt, exists beneath the surface. Based on seismic data, the immense boundary plane of density distribution might be extended downward several ten kilometers across the Moho. According to analysis for the Wenchuan earthquake and aftershocks, most of the earthquakes occurred in the upper and middle crust. Therefore, we suggest that the immense boundary plane of density distribution might be divided into two parts in depth. The deeper part in the westernmost of the Longmenshan fault zone is the boundary of lithosphere blocks, which dips steeply toward northwest. In contrast the shallower part located in the upper and middle crust and dips gently northwest. The boundary of the shallower part at the surface coincides roughly with the Anxian-Guanxian fault, the easternmost one of the Longmenshan fault system. The distance is about 40 similar to 50 km between the boundary of lithosphere block and the Anxian-Guanxian fault. When brittle part of the continental block move along the density boundary surfaces from boundary of lithosphere block to the tectonic boundary on the surface and rupture, earthquake will occur. The area around the Qingchuan-Wenchuan-Dujiangyan exhibits negative magnetic anomalies. Thrust faulting resulted in the overturn of the strata, which in turn caused reversal magnetization.
学科主题	地震地质学
WOS研究方向	Geochemistry & Geophysics
语种	中文
出版者	SCIENCE PRESS
WOS记录号	WOS:000263938300028
内容类型	期刊论文
源URL	[http://119.78.100.197/handle/2HKVOGP0/38955]
专题	中国地质调查局
作者单位	1.[Zhang Ji-Sheng 2.Gao Rui 3.Zeng Ling-Sen 4.Ll Qiu-Sheng 5.Guan Ye 6.He Ri-Zheng 7.Wang Hai-Yan 8.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China 9.中国地质科学院地质研究所
推荐引用方式 GB/T 7714	Zhang, JS ,Gao, R ,Zeng, LS ,et al. Relationship between characteristics of gravity and magnetic anomalies and the earthquakes in Longmenshan range and adjacent areas[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2009,52(2):572-578.
APA	Zhang, JS .,Gao, R .,Zeng, LS .,Ll, QS .,Guan, Y .,...&Li, ZW .(2009).Relationship between characteristics of gravity and magnetic anomalies and the earthquakes in Longmenshan range and adjacent areas.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,52(2),572-578.
MLA	Zhang, JS ,et al."Relationship between characteristics of gravity and magnetic anomalies and the earthquakes in Longmenshan range and adjacent areas".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 52.2(2009):572-578.