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Hidden Roughness of Subducting Seafloor and Implications for Megathrust Seismogenesis: Example From Northern Manila Trench

文献类型：期刊论文

作者Tan, Huiwen4,5,6; Gao, Xiang3,5,6; Wang, Kelin2; Gao, Jinwei1; He, Jiangheng2
刊名GEOPHYSICAL RESEARCH LETTERS
出版日期2022-09-16
卷号49期号:17页码:9
关键词seafloor roughness megathrust earthquake fault strength frictional heating Manila Trench
ISSN号0094-8276
DOI10.1029/2022GL100146
通讯作者Gao, Xiang(xgao@qdio.ac.cn)
英文摘要A smooth subducting seafloor usually leads to a smooth megathrust, which promotes great earthquakes. We present a case study at the northern Manila Trench to emphasize that the process depends also on sediment accretion and deformation. Here, a very rugged igneous basement is hidden beneath a smooth sediment cover on the incoming seafloor. Seismic imaging indicates that most of the sediment is scraped off at the trench, resulting in an uneven decollement interrupted by partially exposed subducted seamounts. New thermal models confirm the presence of large frictional heating, also consistent with a rough and strong megathrust. Our findings in conjunction with the low degree of megathrust locking reported in the literature are compatible with the notion of strong creep. Consequent implications to regional seismic and tsunami hazards call for further investigations, especially with new seafloor geodetic monitoring and improved paleoseismic studies.
资助项目Strategic Priority Research Program of the Chinese Academy of Sciences[XDB42020105] ; National Natural Science Foundation of China[91958211] ; National Natural Science Foundation of China[41722604] ; Youth Innovation Promotion Association CAS[2018401] ; Youth Innovation Promotion Association CAS[Y202052]
WOS研究方向Geology
语种英语
WOS记录号WOS:000849893700001
出版者AMER GEOPHYSICAL UNION
源URL[http://ir.qdio.ac.cn/handle/337002/180924]  
专题海洋研究所_海洋地质与环境重点实验室
海洋研究所_深海极端环境与生命过程研究中心
通讯作者Gao, Xiang
作者单位1.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Lab Marine Geophys & Georesources, Sanya, Peoples R China
2.Geol Survey Canada, Nat Resources Canada, Pacific Geosci Ctr, Sidney, BC, Canada
3.Chinese Acad Sci, Inst Oceanol, Ctr Ocean Mega Sci, Ctr Deep Sea Res, Qingdao, Peoples R China
4.Univ Chinese Acad Sci, Beijing, Peoples R China
5.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China
6.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China
推荐引用方式
GB/T 7714		 Tan, Huiwen,Gao, Xiang,Wang, Kelin,et al. Hidden Roughness of Subducting Seafloor and Implications for Megathrust Seismogenesis: Example From Northern Manila Trench[J]. GEOPHYSICAL RESEARCH LETTERS,2022,49(17):9.
APA Tan, Huiwen,Gao, Xiang,Wang, Kelin,Gao, Jinwei,&He, Jiangheng.(2022).Hidden Roughness of Subducting Seafloor and Implications for Megathrust Seismogenesis: Example From Northern Manila Trench.GEOPHYSICAL RESEARCH LETTERS,49(17),9.
MLA Tan, Huiwen,et al."Hidden Roughness of Subducting Seafloor and Implications for Megathrust Seismogenesis: Example From Northern Manila Trench".GEOPHYSICAL RESEARCH LETTERS 49.17(2022):9.

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来源：海洋研究所

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