IOCAS-IR  > 海洋地质与环境重点实验室
The effect of dynamic topography and gravity on lithospheric effective elastic thickness estimation: a case study
Bai, Yongliang1,2; Dong, Dongdong2; Kirby, Jon F.3; Williams, Simon E.4; Wang, Zhenjie1
2018-07-01
Source PublicationGEOPHYSICAL JOURNAL INTERNATIONAL
ISSN0956-540X
Volume214Issue:1Pages:623-634
Corresponding AuthorBai, Yongliang(yongliang.bai1986@gmail.com)
AbstractLithospheric effective elastic thickness (T-e), a proxy for plIate strength, is helpful for the understanding of subduction characteristics. Affected by curvature, faulting and magma activity, lithospheric strength near trenches should be weakened but some regional inversion studies have shown much higher T-e values along some trenches than in their surroundings. In order to improve T-e-estimation accuracy, here we discuss the long-wavelength effect of dynamic topography and gravity on T-e estimation by taking the Izu-Bonin-Mariana (IBM) Trench as a case study area. We estimate the long-wavelength influence of the density and negative buoyancy of the subducting slab on observed gravity anomalies and seafloor topography. The residual topography and gravity are used to map T-e using the fan-wavelet coherence method. Maps of T-e, both with and without the effects of dynamic topography and slab gravity anomaly, contain a band of high-T-e values along the IBM Trench, though these values and their errors are lower when slab effects are accounted for. Nevertheless, tests show that the T-e map is relatively insensitive to the choice of slab-density modelling method, even though the dynamic topography and slab-induced gravity anomaly vary considerably when the slab density is modelled by different methods. The continued presence of a high-T-e band along the trench after application of dynamic corrections shows that, before using 2-D inversion methods to estimate T-e variations in subduction zones, there are other factors that should be considered besides the slab dynamic effects on the overriding plate.
KeywordLithospheric flexure Gravity anomalies and Earth structure Pacific Ocean Subduction zone processes
DOI10.1093/gji/ggy162
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[41506055] ; National Natural Science Foundation of China[41476042] ; Open Fund of the Key Laboratory of Marine Geology and Environment CAS[MGE2017KG01] ; Fundamental Research Funds for the Central Universities[17CX02003A] ; Key Research Program of the Chinese Academy of Sciences[Y10131]
WOS Research AreaGeochemistry & Geophysics
WOS SubjectGeochemistry & Geophysics
WOS IDWOS:000448235200041
PublisherOXFORD UNIV PRESS
Citation statistics
Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/156605
Collection海洋地质与环境重点实验室
Corresponding AuthorBai, Yongliang
Affiliation1.China Univ Petr, Sch Geosci, Qingdao 266580, Peoples R China
2.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
3.Curtin Univ, Sch Earth & Planetary Sci, Perth, WA 6845, Australia
4.Univ Sydney, Sch Geosci, EarthByte Grp, Sydney, NSW 2006, Australia
First Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Corresponding Author AffilicationInstitute of Oceanology, Chinese Academy of Sciences
Recommended Citation
GB/T 7714
Bai, Yongliang,Dong, Dongdong,Kirby, Jon F.,et al. The effect of dynamic topography and gravity on lithospheric effective elastic thickness estimation: a case study[J]. GEOPHYSICAL JOURNAL INTERNATIONAL,2018,214(1):623-634.
APA Bai, Yongliang,Dong, Dongdong,Kirby, Jon F.,Williams, Simon E.,&Wang, Zhenjie.(2018).The effect of dynamic topography and gravity on lithospheric effective elastic thickness estimation: a case study.GEOPHYSICAL JOURNAL INTERNATIONAL,214(1),623-634.
MLA Bai, Yongliang,et al."The effect of dynamic topography and gravity on lithospheric effective elastic thickness estimation: a case study".GEOPHYSICAL JOURNAL INTERNATIONAL 214.1(2018):623-634.
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