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Reformulation of the Vening-Meinesz Moritz Inverse Problem of Isostasy for Isostatic Gravity Disturbances
National School of Surveying, University of Otago, Dunedin, New Zealand. (Geodesy)
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad, Samhällsbyggnad/GIS-Institutet. (Geodesy)
2012 (engelsk)Inngår i: International Journal of Geosciences, ISSN 2156-8359, E-ISSN 2156-8367, Vol. 3, nr 5A, s. 918-929Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The isostatic gravity anomalies have been traditionally used to solve the inverse problems of isostasy. Since gravity measurements are nowadays carried out together with GPS positioning, the utilization of gravity disturbances in various regional gravimetric applications becomes possible. In global studies, the gravity disturbances can be computed using global geopotential models which are currently available to a relatively high accuracy and resolution. In this study we facilitate the definition of the isostatic gravity disturbances in the Vening-Meinesz Moritz inverse problem of isostasy for finding the Moho depths. We further utilize uniform mathematical formalism in the gravimetric forward modelling based on methods for a spherical harmonic analysis and synthesis of gravity field. We then apply both mathematical procedures to determine globally the Moho depths using the isostatic gravity disturbances. The results of gravimetric inversion are finally compared with the global crustal seismic model CRUST2.0; the RMS fit of the gravimetric Moho model with CRUST2.0 is 5.3 km. This is considerably better than the RMS fit of 7.0 km obtained after using the isostatic gravity anomalies.

sted, utgiver, år, opplag, sider
2012. Vol. 3, nr 5A, s. 918-929
Emneord [en]
Crust, Gravity, Isostasy, Moho Interface, Spherical Harmonics
HSV kategori
Identifikatorer
URN: urn:nbn:se:hig:diva-14940DOI: 10.4236/ijg.2012.325094OAI: oai:DiVA.org:hig-14940DiVA, id: diva2:638050
Tilgjengelig fra: 2013-07-25 Laget: 2013-07-25 Sist oppdatert: 2018-03-13bibliografisk kontrollert

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