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Elastic thickness determination based on Vening Meinesz-Moritz and flexural theories of isostasy
University West, Department of Engineering Science, Division of Mathematics, Computer and Surveying Engineering.ORCID iD: 0000-0003-0067-8631
2018 (English)In: Geophysical Journal International, ISSN 0956-540X, E-ISSN 1365-246X, Vol. 213, no 3, p. 1682-1692Article in journal (Refereed) Published
Abstract [en]

Elastic thickness (Te) is one of mechanical properties of the Earth's lithosphere. The lithosphere is assumed to be a thin elastic shell, which is bended under the topographic, bathymetric and sediment loads on. The flexure of this elastic shell depends on its thickness or Te. Those shells having larger Te flex less. In this paper, a forward computational method is presented based on the Vening Meinesz–Moritz (VMM) and flexural theories of isostasy. Two Moho flexure models are determined using these theories, considering effects of surface and subsurface loads. Different values are selected for Te in the flexural method to see by which one, the closest Moho flexure to that of the VMM is achieved. The effects of topographic/bathymetric, sediments and crustal crystalline masses, and laterally variable upper mantle density, Young's modulus and Poisson's ratio are considered in whole computational process. Our mathematical derivations are based on spherical harmonics, which can be used to estimate Te at any single point, meaning that there is no edge effect in the method. However, the Te map needs to be filtered to remove noise at some points. A median filter with a window size of 5° × 5° and overlap of 4° works well for this purpose. The method is applied to estimate Te over South America using the data of CRUST1.0 and a global gravity model.

Place, publisher, year, edition, pages
2018. Vol. 213, no 3, p. 1682-1692
Keywords [en]
GEODESY and GRAVITY, Gravity anomalies and Earth structure, Loading of the Earth
National Category
Geophysics
Identifiers
URN: urn:nbn:se:hv:diva-12170DOI: 10.1093/gji/ggy075ISI: 000434675800017OAI: oai:DiVA.org:hv-12170DiVA, id: diva2:1185801
Available from: 2018-02-26 Created: 2018-02-26 Last updated: 2018-07-04Bibliographically approved

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Eshagh, Mehdi

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