Comparison of different gravity field implied density models of the topography |
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| Authors: | Morteza Sedighi Seied Hashem Tabatabaee Mehdi Najafi-Alamdari |
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| Institution: | (1) Department of Geophysics, University Kiel, Inst. for Geosiences, Otto-Hahn-Platz 1, 24118 Kiel, Germany;(2) Department of Applied and Environmental Geophysics, Comenius University, Mlynska dol. 842 15, Bratislava, Germany |
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| Abstract: | Density within the Earth crust varies between 1.0 and 3.0 g/cm3. The Bouguer gravity field measured in south Iran is analyzed using four different regional-residual separation techniques
to obtain a residual map of the gravity field suitable for density modeling of topography. A density model of topography with
radial and lateral distribution of density is required for an accurate determination of the geoid, e.g., in the Stokes-Helmert
approach.
The apparent density mapping technique is used to convert the four residual Bouguer anomaly fields into the corresponding
four gravity im-plied subsurface density (GRADEN) models. Although all four density models showed good correlation with the
geological density (GEODEN) model of the region, the GRADEN models obtained by high-pass filter-ing and GGM high-pass filtering
show better numerical correlation with GEODEN model than the other models. |
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