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Comparative study of the uniform and variable Moho density contrast in the Vening Meinesz-Moritz’s isostatic scheme for the gravimetric Moho recovery
Högskolan i Gävle, Akademin för teknik och miljö, Avdelningen för Industriell utveckling, IT och Samhällsbyggnad, Samhällsbyggnad, GIS. (Geospatial Information Science)
The Key Laboratory of Geospace Environment and Geodesy, School of Geodesy and Geomatics, Wuhan University, Wuhan, China.
2016 (Engelska)Ingår i: International Association of Geodesy Symposia: 3rd International Gravity Field Service, IGFS 2014; Shanghai; China; 30 June 2014 through 6 July 2014 / [ed] Jin, S.G., Springer Berlin/Heidelberg, 2016, Vol. 144, s. 199-207Konferensbidrag, Publicerat paper (Refereegranskat)
Abstract [en]

In gravimetric methods for a determination of the Moho geometry, the constant value of the Moho density contract is often adopted. Results of gravimetric and seismic studies, however, showed that the Moho density contrast varies significantly. The assumption of a uniform density contrast thus might yield large errors in the estimated Moho depths. In this study we investigate these errors by comparing the Moho depths determined globally for the uniform and variable models of the Moho density contrast. These two gravimetric results are obtained based on solving the Vening Meinesz-Moritz’s inverse problem of isostasy. The uniform model of the Moho density contrast is defined individually for the continental and oceanic lithosphere to better reproduce the reality. The global data of the lower crust and upper mantle retrieved from the CRUST1.0 seismic crustal model are used to define the variable Moho density contrast. This seismic model is also used to validate both gravimetric solutions. Results of our numerical experiment reveals that the consideration of the variable Moho density contrast improves the agreement between the gravimetric and seismic Moho models; the RMS of differences is 5.4 km (for the uniform density contrast) and 4.7 km (for the variable density contrast).

Ort, förlag, år, upplaga, sidor
Springer Berlin/Heidelberg, 2016. Vol. 144, s. 199-207
Serie
International Association of Geodesy Symposia, ISSN 0939-9585
Nyckelord [en]
Crust, Gravity, Isostasy, Mantle, Moho
Nationell ämneskategori
Geofysik
Identifikatorer
URN: urn:nbn:se:hig:diva-22700DOI: 10.1007/1345_2015_210Scopus ID: 2-s2.0-85014212522ISBN: 9783319398198 (tryckt)OAI: oai:DiVA.org:hig-22700DiVA, id: diva2:1044751
Konferens
IGFS2014, 3rd International Gravity Field Service (IGFS) General Assembly, IAG Symposia, 30 June - 6 July 2014, Shanghai, China
Tillgänglig från: 2016-11-06 Skapad: 2016-11-06 Senast uppdaterad: 2018-12-05Bibliografiskt granskad

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