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Seismogenic structures of the 2006 M(L)4.0 Dangan Island earthquake offshore Hong Kong
Xia, SH; Cao, JH; Sun, JL; Lv, JS; Xu, HL; Zhang, X; Wan, KY; Fan, CY; Zhou, PX; shxia@scsio.ac.cn
2018
Source PublicationJOURNAL OF OCEAN UNIVERSITY OF CHINA
Volume17Issue:1Pages:169-176
AbstractThe northern margin of the South China Sea, as a typical extensional continental margin, has relatively strong intraplate seismicity. Compared with the active zones of Nanao Island, Yangjiang, and Heyuan, seismicity in the Pearl River Estuary is relatively low. However, a M(L)4.0 earthquake in 2006 occurred near Dangan Island (DI) offshore Hong Kong, and this site was adjacent to the source of the historical M5.8 earthquake in 1874. To reveal the seismogenic mechanism of intraplate earthquakes in DI, we systematically analyzed the structural characteristics in the source area of the 2006 DI earthquake using integrated 24-channel seismic profiles, onshore-offshore wide-angle seismic tomography, and natural earthquake parameters. We ascertained the locations of NW- and NE-trending faults in the DI sea and found that the NE-trending DI fault mainly dipped southeast at a high angle and cut through the crust with an obvious low-velocity anomaly. The NW-trending fault dipped southwest with a similar high angle. The 2006 DI earthquake was adjacent to the intersection of the NE- and NW-trending faults, which suggested that the intersection of the two faults with different strikes could provide a favorable condition for the generation and triggering of intraplate earthquakes. Crustal velocity model showed that the high-velocity anomaly was imaged in the west of DI, but a distinct entity with low-velocity anomaly in the upper crust and high-velocity anomaly in the lower crust was found in the south of DI. Both the 1874 and 2006 DI earthquakes occurred along the edge of the distinct entity. Two vertical cross-sections nearly perpendicular to the strikes of the intersecting faults revealed good spatial correlations between the 2006 DI earthquake and the low to high speed transition in the distinct entity. This result indicated that the transitional zone might be a weakly structural body that can store strain energy and release it as a brittle failure, resulting in an earthquake-prone area.
Department[Xia, Shaohong; Cao, Jinghe; Sun, Jinlong; Xu, Huilong; Zhang, Xiang; Wan, Kuiyuan; Fan, Chaoyan; Zhou, Pengxiang] Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China; [Lv, Jinshui; Zhang, Xiang] Seismol Bur Guangdong Prov, Guangzhou 510070, Guangdong, Peoples R China; [Zhang, Xiang; Wan, Kuiyuan; Fan, Chaoyan; Zhou, Pengxiang] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Subject AreaOceanography
WOS KeywordDangan Island ; intraplate seismicity ; South China Sea ; crustal velocity model ; seismogenic structure
Funding ProjectMSG
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17158
Collection中科院边缘海地质重点实验室
Corresponding Authorshxia@scsio.ac.cn
Recommended Citation
GB/T 7714
Xia, SH,Cao, JH,Sun, JL,et al. Seismogenic structures of the 2006 M(L)4.0 Dangan Island earthquake offshore Hong Kong[J]. JOURNAL OF OCEAN UNIVERSITY OF CHINA,2018,17(1):169-176.
APA Xia, SH.,Cao, JH.,Sun, JL.,Lv, JS.,Xu, HL.,...&shxia@scsio.ac.cn.(2018).Seismogenic structures of the 2006 M(L)4.0 Dangan Island earthquake offshore Hong Kong.JOURNAL OF OCEAN UNIVERSITY OF CHINA,17(1),169-176.
MLA Xia, SH,et al."Seismogenic structures of the 2006 M(L)4.0 Dangan Island earthquake offshore Hong Kong".JOURNAL OF OCEAN UNIVERSITY OF CHINA 17.1(2018):169-176.
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