A method of estimating the Moho density contrast with a tentative application of EGM08 and CRUST2.0 |
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| Authors: | Lars E Sjöberg Mohammad Bagherbandi |
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| Institution: | (1) National Geophysical Research Institute (Council of Scientific and Industrial Research), Uppal Road, Hyderabad, 500007, India; |
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| 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. |
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