Preliminary Results of the Seismicity Monitoring Experiment around the 2019 Mw5.4 Earthquake Epicenter in the Central South China Sea Basin
文献类型：期刊论文
| 作者 | Gong, Wenfei4,5; Ruan, Aiguo2,4,5; Niu, Xiongwei1,4; Wang, Zhenjie3; Tan, Pingchuan4; Wei, Xiaodong4; Wang, Wei4,5; Tong, Zhengyi2,4; Cheng, Liqun4; Kong, Fansheng4 |
| 刊名 | JOURNAL OF EARTH SCIENCE
 |
| 出版日期 | 2024-02-01 |
| 卷号 | 35期号:1页码:212-220 |
| ISSN号 | 1674-487X |
| 关键词 | South China Sea microseismic monitoring earthquakes fault broadband OBS |
| DOI | 10.1007/s12583-021-1604-y |
| 通讯作者 | Ruan, Aiguo(ruanag@163.com) ; Niu, Xiongwei(xwniu@sio.org.cn) |
| 英文摘要 | 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. |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| 出版者 | CHINA UNIV GEOSCIENCES, WUHAN |
| WOS记录号 | WOS:001162401600008 |
| 源URL | [http://ir.qdio.ac.cn/handle/337002/184571]  |
| 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.Southern Marine Sci & Engn Guangdong Lab Zhuhai, Zhuhai 519082, Peoples R China 2.Zhejiang Univ, Sch Earth Sci, Hangzhou 310027, Peoples R China 3.Zhejiang Earthquake Adm, Hangzhou 310013, Peoples R China 4.Minist Nat Resources, Inst Oceanog 2, Key Lab Submarine Geosci, Hangzhou 310012, Peoples R China 5.Shanghai Jiao Tong Univ, Sch Oceanog, Shanghai 200240, 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. |
入库方式： OAI收割
来源：海洋研究所
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