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The deep seismogenic environment beneath the Huailai-Zhuolu area and the mechanism of the Zhuolu M4. 3 earthquake on 6 September 2014
Liu Wen-Yu1,2,3,4; Li Tong-Lin3,5; Han Jiang-Tao3,5; Liu Guo-Xing3,5; Chen Yan3; Han Feng-Qing1,2; Han Song3
2017-07-01
Source PublicationCHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION
Volume60Issue:7Pages:2693-2706
SubtypeArticle
AbstractThe Huailai-Zhuolu region is one of the important seismically active areas in the capital circle around Beijing of China. To study the seismogenic mechanism and seismogenic environment of this region, we have completed the magnetotelluric sounding data collection, processing and inversion in NWW direction across the Huailai-Zhuolu basin. We also finished a 3D focusing inversion of existing gravity and magnetic data of this region. Based on the 2D electrical structure and 3D gravity and magnetic structure from above work, in combination with regional geology, seismic exploration and hydrochemical data, we obtained the following perceptions: (1) There exist abnormal bodies of low density, low magnetic, and high conductivity in the middle and lower crust below the Huailai-Zhuolu basin. In planar view, these anomalies trend in NEE as an elliptical distribution, which are the shallowest buried at 12 km depth in the Wenquantun area. The rocks of the basin edge are characterized by high density, medium to high magnetic and high resistivity. The epicenters tend to occur in the intersecting areas of basins and ranges, and seismic sources are located in the gradient zones of physical properties, implying that the differences in electricity, magnetism, density and temperature of middle and lower crust, what's more, the magnetic and temperature characterize the seismogenic setting of this region. (2) The high-conductivity anomalies in the middle and lower crust of the study area may be resulted from joint reaction of the upwelling mantle material and the water in the earth's crust which came from the surface along the fault zones. (3) The genesis of the two major seismic zones located in the northwest edge and the southeast edge of the basin might have a close relation with the migration of internal high-temperature fluid, which means the same heat fluid in the middle and lower crust interacting with surrounding rocks. (4) The possible mechanism of the 2014 Zhuolu M4. 3 earthquake is as follows: Under the NEE directed tectonic stress, the underground heat fluid migrated slowly in the NNW direction. When it was subjected to the impediments of the Dahaituo rock mass, the fluid diverted from the Laojun mountain mouth with a poor stability of structure to the Yanfan basin in the east. During this process of high temperature fluid migration, the Laojun mountain mass was ruptured as right-lateral strike-slip faulting around the Xingyuan village to Wanyao village.
KeywordMagnetotelluric Sounding High Temperature Fluid Deep Seismogenic Environment
WOS HeadingsScience & Technology ; Physical Sciences
WOS Keyword2-DIMENSIONAL INVERSION ; REFINED TECHNIQUES ; ROBUST ESTIMATION ; CAPITAL AREA ; TENSOR
Indexed BySCI
Language英语
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000405160100016
Citation statistics
Document Type期刊论文
Identifierhttp://ir.isl.ac.cn/handle/363002/6230
Collection青海盐湖研究所知识仓储
盐湖地质与环境实验室
Affiliation1.Chinese Acad Sci, Qinghai Inst Salt Lakes, Beijing, Peoples R China
2.Salt Lake Geol & Environm Lab, Xining 810008, Peoples R China
3.Jilin Univ, Jilin Coll Geoexplorat Sci & Technol, Changchun 130026, Peoples R China
4.Univ Chinese Acad Sci, Beijing 101408, Peoples R China
5.Key Lab Appl Geophys, Changchun 130026, Peoples R China
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Liu Wen-Yu,Li Tong-Lin,Han Jiang-Tao,et al. The deep seismogenic environment beneath the Huailai-Zhuolu area and the mechanism of the Zhuolu M4. 3 earthquake on 6 September 2014[J]. CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,2017,60(7):2693-2706.
APA Liu Wen-Yu.,Li Tong-Lin.,Han Jiang-Tao.,Liu Guo-Xing.,Chen Yan.,...&Han Song.(2017).The deep seismogenic environment beneath the Huailai-Zhuolu area and the mechanism of the Zhuolu M4. 3 earthquake on 6 September 2014.CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION,60(7),2693-2706.
MLA Liu Wen-Yu,et al."The deep seismogenic environment beneath the Huailai-Zhuolu area and the mechanism of the Zhuolu M4. 3 earthquake on 6 September 2014".CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION 60.7(2017):2693-2706.
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