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A method of estimating the Moho density contrast with a tentative application of EGM08 and CRUST2.0
KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geoinformatik och Geodesi.
KTH, School of Architecture and the Built Environment (ABE), Urban Planning and Environment, Geoinformatik och Geodesi.
2011 (English)In: ACTA GEOPHYSICA, ISSN 1895-6572, Vol. 59, no 3, 502-525 p.Article in journal (Refereed) Published
Abstract [en]

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 2A degrees x2A degrees. The test computations yielded Moho density contrasts ranging from 81.5 kg/m3 (in Pacific) to 988 kg/m(3) (Tibet), with averages of 678 +/- 78 and 334 +/- 108 kg/m(3) for continental and oceanic regions, respectively, and a global average of 448 +/- 187 kg/m(3). 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.

Place, publisher, year, edition, pages
2011. Vol. 59, no 3, 502-525 p.
Keyword [en]
density contrast, isostasy, Moho, topographic compensation
National Category
Geophysics
Identifiers
URN: urn:nbn:se:kth:diva-33493DOI: 10.2478/s11600-011-0004-6ISI: 000289727800004Scopus ID: 2-s2.0-79955123035OAI: oai:DiVA.org:kth-33493DiVA: diva2:415588
Note
QC 20110509Available from: 2011-05-09 Created: 2011-05-09 Last updated: 2011-05-09Bibliographically approved

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CiteExportLink to record
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