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A method of estimating the Moho density contrast with a tentative application of EGM08 and CRUST2.0

1Royal Institute of Technology, Division of Geodesy, Stockholm, Sweden

© 2011 Institute of Geophysics, Polish Academy of Sciences. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. (CC BY-NC-ND 3.0)

Citation Information: Acta Geophysica. Volume 59, Issue 3, Pages 502–525, ISSN (Online) 1895-7455, ISSN (Print) 1895-6572, DOI: 10.2478/s11600-011-0004-6, April 2011

Publication History

Published Online:
2011-04-20

Abstract

Based on Vening Meinez-Moritz global inverse isostatic problem, the Moho density contrast is formulated as that of finding a solution of a Fredholm integral equation of the first kind. We present solutions to this equation by combining global models of gravity (EGM08), topography (DTM2006) and seismic crust (CRUST2.0) to a resolution of 2°×2°. The test computations yielded Moho density contrasts ranging from 81.5 kg/m3 (in Pacific) to 988 kg/m3 (Tibet), with averages of 678 ± 78 and 334 ± 108 kg/m3 for continental and oceanic regions, respectively, and a global average of 448 ± 187 kg/m3. Estimated Moho depths range from 8 to 75 km with continental and oceanic averages of 36.6 ± 5.3 km and 12.9 ± 5.8 km, respectively, and a global average of 21 ± 12.5 km.

This article has its emphasis on the new theory, while significant corrections to computational results are expected in a forthcoming study, where the isostatic gravity anomaly will be reduced for several disturbing signals.

Keywords: density contrast; isostasy; Moho; topographic compensation

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