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

doi:10.1029/2022GL100146

IOCAS-IR > 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, Huiwen1,2,3 ; Gao, Xiang 1,2,4; Wang, Kelin 5; Gao, Jinwei6 ; He, Jiangheng 5
	2022-09-16
发表期刊	GEOPHYSICAL RESEARCH LETTERS
ISSN	0094-8276
卷号	49 期号:17 页码:9
通讯作者	Gao, Xiang([email protected])
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.
关键词	seafloor roughness megathrust earthquake fault strength frictional heating Manila Trench
DOI	10.1029/2022GL100146
收录类别	SCI
语种	英语
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
WOS类目	Geosciences, Multidisciplinary
WOS记录号	WOS:000849893700001
出版者	AMER GEOPHYSICAL UNION
引用统计	被引频次：3[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/180925
专题	海洋地质与环境重点实验室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 Oceanol, Key Lab Marine Geol & Environm, Qingdao, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao, Peoples R China 3.Univ Chinese Acad Sci, Beijing, Peoples R China 4.Chinese Acad Sci, Inst Oceanol, Ctr Ocean Mega Sci, Ctr Deep Sea Res, Qingdao, Peoples R China 5.Geol Survey Canada, Nat Resources Canada, Pacific Geosci Ctr, Sidney, BC, Canada 6.Chinese Acad Sci, Inst Deep Sea Sci & Engn, Lab Marine Geophys & Georesources, Sanya, Peoples R China
第一作者单位	中国科学院海洋研究所
通讯作者单位	中国科学院海洋研究所
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.