Estimates of effective elastic thickness at subduction zones

doi:10.1016/j.jog.2018.04.007

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

	Estimates of effective elastic thickness at subduction zones
	Yang, An 1,2; Fu, Yongtao 1,2
刊名	JOURNAL OF GEODYNAMICS
	2018-06-01
卷号	117 页码:75-87
关键词	Effective elastic thickness Flexure Oceanic lithosphere Subsurface loading Moving window admittance technique Subduction zones
ISSN号	0264-3707
DOI	10.1016/j.jog.2018.04.007
通讯作者	Yang, An(yangan@qdio.ac.cn)
英文摘要	The effective elastic thickness (T-e) is an important parameter that characterizes the long-term strength of the lithosphere. Estimates of T-e at subduction zones have important tectonic and geodynamic implications, providing constraints for the strength of the oceanic lithosphere at a short-term scale. We estimated T-e values in several subduction zones worldwide by using models including both surface and subsurface loads from the analysis of free-air gravity anomaly and bathymetric data, together with a moving window admittance technique (MWAT). Tests with synthetic gravity and bathymetry data show that this method is a reliable way to recover T-e of oceanic lithosphere. Our results show that there is a noticeable reduction in the effective elastic thickness of the subducting plate from the outer rise to the trench axis for most studied subduction zones, suggesting plate weakening at the trench-outer rise of the subduction zones. These subduction zones have T-e range of 6-60 km, corresponding to a wide range of isotherms from 200 to 800 degrees C. Different trenches show distinct patterns. The Caribbean, Kuril-Japan, Mariana and Tonga subduction zones show predominantly high T-e. By contrast, the Middle America and Java subduction zones have a much lower T-e. The Peru-Chile, Aleutian and Philippine subduction zones show considerable scatter. The large variation of the isotherm for different trenches does not show dear relationship with plate weakening at the outer rise.
资助项目	National Programme on Global Change and Air-Sea Interaction[GASI-GEOGE-02] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA1103010102] ; Open Fund of the Key Laboratory of Marine Geology and Environment, Chinese Academy of Sciences[MGE2015KG07]
WOS研究方向	Geochemistry & Geophysics
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000434748600007
内容类型	期刊论文
源URL	[http://ir.qdio.ac.cn/handle/337002/159383]
专题	海洋研究所_海洋地质与环境重点实验室
通讯作者	Yang, An
作者单位	1.Chinese Acad Sci, Key Lab Marine Geol & Environm, Inst Oceanol, Qingdao 266071, Peoples R China 2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China
推荐引用方式 GB/T 7714	Yang, An,Fu, Yongtao. Estimates of effective elastic thickness at subduction zones[J]. JOURNAL OF GEODYNAMICS,2018,117:75-87.
APA	Yang, An,&Fu, Yongtao.(2018).Estimates of effective elastic thickness at subduction zones.JOURNAL OF GEODYNAMICS,117,75-87.
MLA	Yang, An,et al."Estimates of effective elastic thickness at subduction zones".JOURNAL OF GEODYNAMICS 117(2018):75-87.