Hidden Roughness of Subducting Seafloor and Implications for Megathrust Seismogenesis: Example From Northern Manila Trench | |
Tan, Huiwen3,4,5; Gao, Xiang2,3,5; Wang, Kelin1; Gao, Jinwei6; He, Jiangheng1 | |
刊名 | GEOPHYSICAL RESEARCH LETTERS |
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 |
DOI | 10.1029/2022GL100146 |
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关键词 | SOUTH CHINA SEA ; TSUNAMI HAZARD ASSESSMENT ; CRUSTAL STRUCTURE ; HEAT-FLOW ; MAGMATISM ; DEFORMATION ; TAIWAN ; EARTHQUAKES ; EVOLUTION ; FEATURES |
WOS研究方向 | Geology |
语种 | 英语 |
出版者 | AMER GEOPHYSICAL UNION |
WOS记录号 | WOS:000849893700001 |
资助机构 | Strategic Priority Research Program of the Chinese Academy of Sciences ; National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS |
内容类型 | 期刊论文 |
源URL | [http://ir.idsse.ac.cn/handle/183446/9716] |
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 | Gao, Xiang |
作者单位 | 1.Geol Survey Canada, Nat Resources Canada, Pacific Geosci Ctr, Sidney, BC, Canada 2.Chinese Acad Sci, Inst Oceanol, Ctr Ocean Mega Sci, Ctr Deep Sea Res, Qingdao, Peoples R China 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China 4.Univ Chinese Acad Sci, Beijing, Peoples R China 5.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China 6.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Lab Marine Geophys & Georesources, Sanya, 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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