Seismogenic crustal structure affected by the Hainan mantle plume
文献类型:期刊论文
作者 | Lin, Jiangnan3,4; Xia, Shaohong2,4; Wang, Xinyang2,4; Zhao, Dapeng1; Wang, Dawei5 |
刊名 | GONDWANA RESEARCH |
出版日期 | 2022-03-01 |
卷号 | 103页码:23-36 |
ISSN号 | 1342-937X |
关键词 | 3-D seismogenic structure Earthquake swarms Hainan plume Magmatic fluids Ocean bottom seismometers |
DOI | 10.1016/j.gr.2021.10.029 |
通讯作者 | Xia, Shaohong |
目次 | 否 |
英文摘要 | Mantle plumes are one of the most influential first-order tectonic systems on Earth, playing a prominent role in controlling local magmatic activity and seismicity. Recent studies have shown that the Hainan mantle plume originates from the lower mantle and its volcanic activity is still intense during the Holocene. However, the effect of the Hainan plume on local seismicity is still unclear. In this study, we conducted the first wide-angle seismic survey in the source area of the 1969 earthquake doublet (M 5.1 and 5.2) offshore Hainan Island. A high-resolution 3-D P-wave velocity model of the crust is obtained using a large amount of Pg and PmP arrival times recorded by a portable array consisting of 17 ocean bot-tom seismographs (OBSs). Our results show that the 1969 earthquake doublet occurred in high-to-low velocity transitional zones which correspond to active faults. Prominent low-velocity anomalies are revealed in the crust of the study area, which may reflect magmatic intrusion channels. On the basis of multiple geophysical evidence including multi-channel seismic reflection profiles, geothermal data, and seismic tomography results, we infer that the low-velocity anomalies in the source area may reflect magmas and fluids from the Hainan plume, and high-angle normal faults in the crust serve as conduits for ascending of the magmas and fluids. The 1969 earthquake doublet offshore Hainan Island can be attrib-uted to the magma-hydrothermal alteration processes in the fault zones, which led to the significant reduction of the fault strength and friction coefficient, facilitating the shear failure propagation. Furthermore, the seismicity in and around Hainan Island exhibits distinct swarm-like behaviors, which is also evidence for the Hainan plume affecting the crustal seismicity. (c) 2021 International Association for Gondwana Research. Published by Elsevier B.V. All rights reserved. |
WOS关键词 | SOUTH CHINA SEA ; MAGMATIC PLUMBING SYSTEM ; EARTHQUAKE DOUBLET ; QIONGDONGNAN BASIN ; SPATIAL-DISTRIBUTION ; POSTRIFT MAGMATISM ; CONTINENTAL-MARGIN ; VELOCITY STRUCTURE ; SEISMIC STRUCTURE ; KILAUEA VOLCANO |
资助项目 | National Natural Science Foundation of China[42076071] ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)[GML2019ZD0204] ; Key Research and Development Plan of Hainan Province[ZDYF2020198] ; Foundation of Guangdong Province of China[2019BT02H594] ; Rising Star Foundation of the South China Sea Institute of Oceanology (SCSIO)[NHXX2017DZ0101] ; NSFC Open Research Cruise[NORC2017-08] |
WOS研究方向 | Geology |
语种 | 英语 |
出版者 | ELSEVIER |
WOS记录号 | WOS:000752721000002 |
资助机构 | National Natural Science Foundation of China ; Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) ; Key Research and Development Plan of Hainan Province ; Foundation of Guangdong Province of China ; Rising Star Foundation of the South China Sea Institute of Oceanology (SCSIO) ; NSFC Open Research Cruise |
源URL | [http://ir.idsse.ac.cn/handle/183446/9335] |
专题 | 深海科学研究部_深海地球物理与资源研究室 |
通讯作者 | Xia, Shaohong |
作者单位 | 1.Tohoku Univ, Grad Sch Sci, Dept Geophys, Sendai, Miyagi 9808578, Japan 2.Southern Marine Sci & Engn Guangdong Lab Guangzh, Guangzhou 511458, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Peoples R China 5.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Sanya 572000, Peoples R China |
推荐引用方式 GB/T 7714 | Lin, Jiangnan,Xia, Shaohong,Wang, Xinyang,et al. Seismogenic crustal structure affected by the Hainan mantle plume[J]. GONDWANA RESEARCH,2022,103:23-36. |
APA | Lin, Jiangnan,Xia, Shaohong,Wang, Xinyang,Zhao, Dapeng,&Wang, Dawei.(2022).Seismogenic crustal structure affected by the Hainan mantle plume.GONDWANA RESEARCH,103,23-36. |
MLA | Lin, Jiangnan,et al."Seismogenic crustal structure affected by the Hainan mantle plume".GONDWANA RESEARCH 103(2022):23-36. |
入库方式: OAI收割
来源:深海科学与工程研究所
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