Crustal structure revealed by a deep seismic sounding profile of Baijing-Gaoming-Jinwan in the Pearl River Delta

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 中科院边缘海地质重点实验室

	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
刊名	JOURNAL OF OCEAN UNIVERSITY OF CHINA
	2018
卷号	17 期号:1 页码:186-194
通讯作者	1424201562@qq.com
中文摘要	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.
学科主题	Oceanography
关键词[WOS]	Pearl River Estuary ; seismic sounding profile ; crustal structure ; Kaiping-Enping fault ; earthquake potential
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/17160]
专题	南海海洋研究所_中科院边缘海地质重点实验室
推荐引用方式 GB/T 7714	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.(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.