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Crustal structure revealed by a deep seismic sounding profile of Baijing-Gaoming-Jinwan in the Pearl River Delta
Zhang, X; Ye, XW; Lv, JS; Sun, JL; Wang, XN; 1424201562@qq.com
2018
发表期刊JOURNAL OF OCEAN UNIVERSITY OF CHINA
卷号17期号:1页码:186-194
摘要The Pearl River Estuary area, located in the middle part of the southern China coastal seismic belt, has long been considered a potential source of strong earthquakes above magnitude 7.0. To scientifically assess the potential strong earthquake risk in this area, a three-dimensional artificial seismic sounding experiment, consisting of a receiving array and seabed seismograph, was performed to reveal the deep crustal structure in this region. We used artificial ship-borne air-gun excitation shots as sources, and fixed and mobile stations as receivers to record seismic data from May to August 2015. This paper presents results along a line from the western side of the Pearl River Estuary to the western side of the Baijing-Gaoming-Jinwan profile. A two-dimensional velocity structure was constructed using seismic travel-time tomography. The inversion results show that the Moho depth is 27 km in the coastal area and 30 km in the northwest of the Pearl River Estuary area, indicating that the crust thins from land to sea. Two structural discontinuities and multiple low-velocity anomalies appear in the crustal section. Inside both discontinuity zones, a low-velocity layer, with a minimum velocity of 6.05 km s(-1), exists at a depth of about 15 km, and another, with a minimum velocity of 6.37 km s(-1), exists at a depth of about 21.5 km between the middle and lower crust. These low velocities suggest that the discontinuities may consist of partly molten material. Earthquakes with magnitudes higher than 5.0 occurred in the low-velocity layer along the profile. The deep Kaiping-Enping fault, rooted in the crust, may be one of the most important channels for deep material upwelling and is related to tectonic movement since the Cretaceous in the Pearl River Delta tectonic rift basin.
部门归属[Zhang, Xiang; Sun, Jinlong] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean Geol, Guangzhou 510301, Guangdong, Peoples R China; [Zhang, Xiang] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Zhang, Xiang; Ye, Xiuwei; Lv, Jinshui; Wang, Xiaona] China Earthquake Adm, Guangdong Earthquake Agcy, Guangzhou 510070, Guangdong, Peoples R China
学科领域Oceanography
关键词[WOS]Pearl River Estuary ; seismic sounding profile ; crustal structure ; Kaiping-Enping fault ; earthquake potential
资助项目MSG
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/17160
专题中科院边缘海地质重点实验室
通讯作者1424201562@qq.com
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Zhang, X,Ye, XW,Lv, JS,et al. Crustal structure revealed by a deep seismic sounding profile of Baijing-Gaoming-Jinwan in the Pearl River Delta[J]. JOURNAL OF OCEAN UNIVERSITY OF CHINA,2018,17(1):186-194.
APA Zhang, X,Ye, XW,Lv, JS,Sun, JL,Wang, XN,&1424201562@qq.com.(2018).Crustal structure revealed by a deep seismic sounding profile of Baijing-Gaoming-Jinwan in the Pearl River Delta.JOURNAL OF OCEAN UNIVERSITY OF CHINA,17(1),186-194.
MLA Zhang, X,et al."Crustal structure revealed by a deep seismic sounding profile of Baijing-Gaoming-Jinwan in the Pearl River Delta".JOURNAL OF OCEAN UNIVERSITY OF CHINA 17.1(2018):186-194.
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