| Estimates of effective elastic thickness at subduction zones | |
| Yang, An1,2; Fu, Yongtao1,2 | |
| 2018-06-01 | |
| Source Publication | JOURNAL OF GEODYNAMICS
 |
| ISSN | 0264-3707 |
| Volume | 117Pages:75-87 |
| Corresponding Author | Yang, An(yangan@qdio.ac.cn) |
| Abstract | 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. |
| Keyword | Effective elastic thickness Flexure Oceanic lithosphere Subsurface loading Moving window admittance technique Subduction zones |
| DOI | 10.1016/j.jog.2018.04.007 |
| Indexed By | SCI |
| Language | 英语 |
| Funding Project | 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 Research Area | Geochemistry & Geophysics |
| WOS Subject | Geochemistry & Geophysics |
| WOS ID | WOS:000434748600007 |
| Publisher | PERGAMON-ELSEVIER SCIENCE LTD |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.qdio.ac.cn/handle/337002/159384 |
| Collection | 海洋地质与环境重点实验室 |
| Corresponding Author | Yang, An |
| Affiliation | 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 |
| First Author Affilication | Institute of Oceanology, Chinese Academy of Sciences |
| Corresponding Author Affilication | Institute 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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