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

doi:10.1029/2022GL100146

CORC > 海洋研究所 > 中国科学院海洋研究所 > 海洋地质与环境重点实验室

	Hidden Roughness of Subducting Seafloor and Implications for Megathrust Seismogenesis: Example From Northern Manila Trench
	Tan, Huiwen 4,5,6; Gao, Xiang 3,5,6; Wang, Kelin 2; Gao, Jinwei 1; He, Jiangheng 2
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研究方向	Geology
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000849893700001
内容类型	期刊论文
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
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.