Preliminary Results of the Seismicity Monitoring Experiment around the 2019 <i>M</i>w5.4 Earthquake Epicenter in the Central South China Sea Basin

doi:10.1007/s12583-021-1604-y

IOCAS-IR

	Preliminary Results of the Seismicity Monitoring Experiment around the 2019 Mw5.4 Earthquake Epicenter in the Central South China Sea Basin
	Gong, Wenfei 1,2; Ruan, Aiguo 1,2,4; Niu, Xiongwei 2,5; Wang, Zhenjie 3; Tan, Pingchuan 2; Wei, Xiaodong 2; Wang, Wei 1,2; Tong, Zhengyi 2,4; Cheng, Liqun 2; Kong, Fansheng 2; Lu, Shaoping 6; Fan, Jianke 7; Ding, Weiwei 1,2,4; Gao, Jinyao 2; Yang, Chunguo 2; Li, Jiabiao 1,2,4
	2024-02-01
发表期刊	JOURNAL OF EARTH SCIENCE
ISSN	1674-487X
卷号	35 期号:1 页码:212-220
通讯作者	Ruan, Aiguo([email protected]) ; Niu, Xiongwei([email protected])
摘要	On September 5, 2019, a moderate earthquake of Mw5.4 unexpectedly occurred in the apparently quiescent central basin of the South China Sea. We immediately carried out a seismicity monitoring experiment around the epicenter by using broadband ocean bottom seismometers (OBS) for the following three scientific targets. The first is knowing the earthquake seismogenic mechanism, fault structure and further development. The second is finding the role of the residual spreading ridge playing in earthquake processes and further revealing the deep structures of the ridge directional turning area. The third is confirming the existence and significance of the so called "Zhongnan fault". This paper reports the preliminary results of the first phase experiment. Five OBSs were deployed for seismicity monitoring with a duration of 288 days, but only three were recovered. Micro-earthquakes were firstly detected by an automatic seismic phase picking algorithm and then were verified by analyzing their seismic phases and time-frequency characteristics in detail. A total of 21, 68 and 89 micro-earthquakes were picked out from the three OBSs respectively within the distance of 30 km. The dominant frequency of these micro-earthquakes is 12-15 Hz, indicating tectonic fracturing. During the first two months after the mainshock the seismicity was relatively stronger, and micro-earthquakes were still occurring occasionally till the end of observation, indicating the epicenter area is active. We used Match&Locate method to locate 57 micro-earthquakes preliminarily. Their spatial distribution shows that the seismicity is developed mainly along the NE direction roughly parallel to the residual ridge with depth variations between 10-20 km.
关键词	South China Sea microseismic monitoring earthquakes fault broadband OBS
DOI	10.1007/s12583-021-1604-y
收录类别	SCI
语种	英语
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:001162401600008
出版者	CHINA UNIV GEOSCIENCES, WUHAN
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/184572
专题	中国科学院海洋研究所
通讯作者	Ruan, Aiguo; Niu, Xiongwei
作者单位	1.Shanghai Jiao Tong Univ, Sch Oceanog, Shanghai 200240, Peoples R China 2.Minist Nat Resources, Inst Oceanog 2, Key Lab Submarine Geosci, Hangzhou 310012, Peoples R China 3.Zhejiang Earthquake Adm, Hangzhou 310013, Peoples R China 4.Zhejiang Univ, Sch Earth Sci, Hangzhou 310027, Peoples R China 5.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519082, Peoples R China 6.Sun Yat Sen Univ, Sch Earth Sci & Engn, Zhuhai 519082, Peoples R China 7.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Gong, Wenfei,Ruan, Aiguo,Niu, Xiongwei,et al. Preliminary Results of the Seismicity Monitoring Experiment around the 2019 Mw5.4 Earthquake Epicenter in the Central South China Sea Basin[J]. JOURNAL OF EARTH SCIENCE,2024,35(1):212-220.
APA	Gong, Wenfei.,Ruan, Aiguo.,Niu, Xiongwei.,Wang, Zhenjie.,Tan, Pingchuan.,...&Li, Jiabiao.(2024).Preliminary Results of the Seismicity Monitoring Experiment around the 2019 Mw5.4 Earthquake Epicenter in the Central South China Sea Basin.JOURNAL OF EARTH SCIENCE,35(1),212-220.
MLA	Gong, Wenfei,et al."Preliminary Results of the Seismicity Monitoring Experiment around the 2019 Mw5.4 Earthquake Epicenter in the Central South China Sea Basin".JOURNAL OF EARTH SCIENCE 35.1(2024):212-220.