气候变化领域集成服务门户(CCPortal): Iterative approaches for regional Moho determination using on-orbit gravity gradients: a case study in Qinghai-Tibet Plateau and its near zone

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DOI	10.1093/gji/ggad281
	Iterative approaches for regional Moho determination using on-orbit gravity gradients: a case study in Qinghai-Tibet Plateau and its near zone
	Li, Wei-Kai; Mu, Qing-Lu; Yang, Meng; Feng, Wei; Zhong, Min
发表日期	2023
ISSN	0956-540X
EISSN	1365-246X
起始页码	765
结束页码	777
卷号	235 期号:1
英文摘要	Moho determination is an important issue in studying the Earth's interior structure. In accordance with the isostasy-compensation hypothesis in geodesy, it is possible to recover regional or global Moho by employing gravimetric data. The nonlinear property is one of the main difficulties in solving the inverse problem of isostasy. To effectively address this issue, we propose an improved iterative inversion method that combines 3-D integration and linear regularization to achieve an approximate nonlinear solution. To estimate the contributions of different components in the gravity-gradient tensor from the Gravity field and steady-state Ocean Circulation Explorer (GOCE), other than the vertical component, we additionally develop two joint inversion scenarios that utilize diagonal horizontal components and all five non-vertical components. The validating experiments are implemented in Qinghai-Tibet Plateau and its near zone. Simulations and applications illustrate that horizontal responses of Moho undulation are also significant. Yet the off-diagonal components provide minimal contributions, adding only 0.25 km of bias to the joint inversion results. Truncation effects serve as the primary source of systematic errors, resulting in & SIM;1 km error in vertical inversion results and & SIM;2.3 km error in joint inversion results. Then, the gravimetric Moho results are compared with CRUST1.0, and they show a generally strong correlation. Differences are obvious at the northern and eastern margins of the plateau. It is maybe due to the local changes in crust-mantle density contrasts. Upwelling of asthenospheric materials and fluid flow in the middle-lower crust are the two main factors. Based on high-precision satellite gravimetry, our study could provide new insights into the tectonic structure of Qinghai-Tibet Plateau.
关键词	Geopotential theory Gravity anomalies and Earth structure Satellite gravity Inverse theory
英文关键词	MORITZ INVERSE PROBLEM; CRUSTAL THICKNESS; STRUCTURE BENEATH; EASTERN MARGIN; MODELS; FIELD; REGULARIZATION; VALIDATION; RECOVERY; DEPTH
WOS研究方向	Geochemistry & Geophysics
WOS记录号	WOS:001034123000003
来源期刊	GEOPHYSICAL JOURNAL INTERNATIONAL
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/283158
作者单位	Chinese Academy of Sciences; Chinese Academy of Sciences; University of Chinese Academy of Sciences, CAS; Sun Yat Sen University; Sun Yat Sen University
推荐引用方式 GB/T 7714	Li, Wei-Kai,Mu, Qing-Lu,Yang, Meng,et al. Iterative approaches for regional Moho determination using on-orbit gravity gradients: a case study in Qinghai-Tibet Plateau and its near zone[J],2023,235(1).
APA	Li, Wei-Kai,Mu, Qing-Lu,Yang, Meng,Feng, Wei,&Zhong, Min.(2023).Iterative approaches for regional Moho determination using on-orbit gravity gradients: a case study in Qinghai-Tibet Plateau and its near zone.GEOPHYSICAL JOURNAL INTERNATIONAL,235(1).
MLA	Li, Wei-Kai,et al."Iterative approaches for regional Moho determination using on-orbit gravity gradients: a case study in Qinghai-Tibet Plateau and its near zone".GEOPHYSICAL JOURNAL INTERNATIONAL 235.1(2023).