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Seismotectonics of the Taiwan Shoal region in the northeastern South China Sea: Insights from the crustal structure
Wan, KY; Sun, JL; Xu, HL; Xie, XL; Xia, SH; Zhang, X; Cao, JH; Zhao, F; Fan, CY; shxia@scsio.ac.cn
2018
Source PublicationJOURNAL OF OCEAN UNIVERSITY OF CHINA
Volume17Issue:1Pages:156-168
AbstractA cluster of earthquakes occurred in the Taiwan Shoal region on the outer rise of the Manila Trench. Although most were of small to medium magnitudes, one strong earthquake occurred on September 16, 1994. Several previous studies have provided important information to progress our understanding of this single earthquake. However, little is currently known about the earthquake cluster, and it is necessary to investigate the deep crustal structure of the Taiwan Shoal region to understand the mechanisms involved in controlling and generating it. This study presents a two-dimensional seismic tomographic image of the crustal structure along the OBS2012 profile based on ocean-bottom seismograph (OBS) data, which exhibits a high-velocity anomaly flanked by low-velocity anomalies in the upper crust beneath the Taiwan Shoal. In this study, 765 earthquakes (Richter magnitude M-L > 1.5) occurring between 1991 and 2015 were studied and analyses of earthquake epicenters, regional faults, and the crustal structure provides an improved understanding of the nature of active tectonics in this region. Results of analyses indicate firstly that the high-velocity area represents major asperities that correspond to the location of the earthquake cluster and where stress is concentrated. It is also depicted that the earthquake cluster was influenced by fault interactions. However, the September 1994 earthquake occurred independently of these seismic activities and was associated with reactivation of a preexisting fault. It is also determined that slab pull is resisted by the exposed precollision accretionary prism, and the resistive force is causing accumulation of inplane compressive-stress. This may trigger a future damaging earthquake in the Taiwan Shoal region.
Department[Wan, Kuiyuan; Sun, Jinlong; Xu, Huilong; Xia, Shaohong; Cao, Jinghe; Zhao, Fang; Fan, Chaoyan] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Wan, Kuiyuan; Fan, Chaoyan] Univ Chinese Acad Sci, Beijing 100049, Peoples R China; [Xie, Xiaoling] Earthquake Adm Hainan Prov, Haikou 570203, Hainan, Peoples R China; [Zhang, Xiang] Earthquake Adm Guangdong Prov, Guangzhou 510070, Guangdong, Peoples R China
Subject AreaOceanography
WOS Keywordearthquake cluster ; crustal structure ; fault interactions ; outer rise ; Taiwan Shoal
Funding ProjectMSG
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17157
Collection中科院边缘海地质重点实验室
Corresponding Authorshxia@scsio.ac.cn
Recommended Citation
GB/T 7714
Wan, KY,Sun, JL,Xu, HL,et al. Seismotectonics of the Taiwan Shoal region in the northeastern South China Sea: Insights from the crustal structure[J]. JOURNAL OF OCEAN UNIVERSITY OF CHINA,2018,17(1):156-168.
APA Wan, KY.,Sun, JL.,Xu, HL.,Xie, XL.,Xia, SH.,...&shxia@scsio.ac.cn.(2018).Seismotectonics of the Taiwan Shoal region in the northeastern South China Sea: Insights from the crustal structure.JOURNAL OF OCEAN UNIVERSITY OF CHINA,17(1),156-168.
MLA Wan, KY,et al."Seismotectonics of the Taiwan Shoal region in the northeastern South China Sea: Insights from the crustal structure".JOURNAL OF OCEAN UNIVERSITY OF CHINA 17.1(2018):156-168.
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