A method of estimating the Moho density contrast with a tentative application of EGM08 and CRUST2.0
2011 (English)In: ACTA GEOPHYSICA, ISSN 1895-6572, Vol. 59, no 3, 502-525 p.Article in journal (Refereed) Published
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.
density contrast, isostasy, Moho, topographic compensation
IdentifiersURN: urn:nbn:se:kth:diva-33493DOI: 10.2478/s11600-011-0004-6ISI: 000289727800004ScopusID: 2-s2.0-79955123035OAI: oai:DiVA.org:kth-33493DiVA: diva2:415588
QC 201105092011-05-092011-05-092011-05-09Bibliographically approved