SCSIO OpenIR  > 中科院边缘海地质重点实验室
Lithospheric 3-D flexural modelling of subducted oceanic plate with variable effective elastic thickness along the Manila Trench
Zhang, Jiangyang1; Sun, Zhen; Xu, Min; Yang, Hongfeng2; Zhang, Yunfan; Li, Fucheng
2018
Source PublicationGEOPHYSICAL JOURNAL INTERNATIONAL
ISSN0956-540X
Volume215Issue:3Pages:2071
AbstractFlexural rigidity, indicated by the effective elastic thickness, is important for describing the mechanical behaviour of the subducted oceanic lithosphere in the thin plate model. 2-D thin plate models have been widely used in estimating the effective elastic thickness (T-e) of the oceanic lithosphere at subduction zones and collision zones. However, realistic lithospheric flexural modelling of the subducted oceanic plates should account for the lateral variation of T-e along the strike of the trench. We present a 3-D finite-difference flexural bending model that includes variable flexural parameters in all directions. We compare the results with 2-D flexural models, and we discuss the differences in estimating T-e within the bending plate at subduction zones. Theoretical analysis shows that when T-e changes only slightly along the trench, a 2-D model can sufficiently estimate T-e, when T-e changes sharply because of the effects of seamount loading and bending near the trench, tearing of the subducting plate, or the transition from subduction zone to collision zone; the T-e values calculated by 2-D models may produce errors up to 30 per cent compared with those predicted using a 3-D model, because they fail to account for the lateral slab-pulling force. We evaluate the differences between using 2-D and 3-D flexural model assumptions by simulating bending of the subducted oceanic plate at the northern Manila Trench. The results show that from the subduction zone to the collision zone, T-e estimated from the 2-D model gradually changes from 20.2 to 32.9 km, whereas T-e estimated from the 3-D model changes sharply at the continent-oceanic transition zone of the northern margin of the South China Sea.
DepartmentOMG
KeywordElasticity and anelasticity Lithospheric flexure Mechanics, theory, and modelling Subduction zone processes
DOI10.1093/gji/ggy393
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/17988
Collection中科院边缘海地质重点实验室
Affiliation1.Chinese Acad Sci, South China Sea Inst Oceanol, CAS Key Lab Ocean & Marginal Sea Geol, Guangzhou 510301, Guangdong, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Chinese Univ Hong Kong, Fac Sci, Earth Syst Sci Programme, Shatin, Hong Kong, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Jiangyang,Sun, Zhen,Xu, Min,et al. Lithospheric 3-D flexural modelling of subducted oceanic plate with variable effective elastic thickness along the Manila Trench[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2018,215(3):2071, 2092.
APA Zhang, Jiangyang,Sun, Zhen,Xu, Min,Yang, Hongfeng,Zhang, Yunfan,&Li, Fucheng.(2018).Lithospheric 3-D flexural modelling of subducted oceanic plate with variable effective elastic thickness along the Manila Trench.GEOPHYSICAL JOURNAL INTERNATIONAL,215(3),2071.
MLA Zhang, Jiangyang,et al."Lithospheric 3-D flexural modelling of subducted oceanic plate with variable effective elastic thickness along the Manila Trench".GEOPHYSICAL JOURNAL INTERNATIONAL 215.3(2018):2071.
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