IOCAS-IR  > 海洋地质与环境重点实验室
Estimates of effective elastic thickness at subduction zones
Yang, An1,2; Fu, Yongtao1,2
2018-06-01
Source PublicationJOURNAL OF GEODYNAMICS
ISSN0264-3707
Volume117Pages:75-87
Corresponding AuthorYang, An(yangan@qdio.ac.cn)
AbstractThe 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.
KeywordEffective elastic thickness Flexure Oceanic lithosphere Subsurface loading Moving window admittance technique Subduction zones
DOI10.1016/j.jog.2018.04.007
Indexed BySCI
Language英语
Funding ProjectNational 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 Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000434748600007
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/159384
Collection海洋地质与环境重点实验室
Corresponding AuthorYang, An
Affiliation1.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
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
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.
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