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Recovery of Moho's undulations based on the Vening Meinesz-Moritz theory from satellite gravity gradiometry data: A simulation study
Royal Institute of Technology (KTH), Division of Geodesy and Geoinformatics.
Department of Surveying, Islamic Azad University, Shahr-e-Rey Branch, Tehran, Iran.ORCID iD: 0000-0003-0067-8631
2012 (English)In: Advances in Space Research, ISSN 0273-1177, E-ISSN 1879-1948, Vol. 49, no 6, p. 1097-1111Article in journal (Refereed) Published
Abstract [en]

In the gravimetric approach to determine the Moho depth an isostatic hypothesis can be used. The Vening Meinesz–Moritz isostatic hypothesis is the recent theory for such a purpose. Here, this theory is further developed so that the satellite gravity gradiometry (SGG) data are used for recovering the Moho depth through a nonlinear integral inversion procedure. The kernels of its forward and inverse problems show that the inversion should be done in a larger area by 5° than the desired one to reduce the effect of the spatial truncation error of the integral formula. Our numerical study shows that the effect of this error on the recovered Moho depths can reach 6 km in Persia and it is very significant. The iterative Tikhonov regularization in a combination with either generalized cross validation or quasi-optimal criterion of estimating the regularization parameter seems to be suitable and the solution is semi-convergent up to the third iteration. Also the Moho depth recovered from the simulated SGG data will be more or less the same as that obtained from the terrestrial gravimetric data with a root mean square error of 2 km and they are statistically consistent.

Place, publisher, year, edition, pages
2012. Vol. 49, no 6, p. 1097-1111
Keywords [en]
Density contrast; Integral inversion; Isostatic compensation; Iterative Tikhonov regularization; Mohorovičič discontinuity; Nonlinear ill-posed problem
National Category
Geophysics
Identifiers
URN: urn:nbn:se:hv:diva-5307DOI: 10.1016/j.asr.2011.12.033ISI: 000301636200009OAI: oai:DiVA.org:hv-5307DiVA, id: diva2:617370
Available from: 2013-04-23 Created: 2013-04-23 Last updated: 2017-12-06Bibliographically approved

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Eshagh, Mehdi

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CiteExportLink to record
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  • apa
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