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INVESTIGATIONS OF THE EFFECTS OF TOPOGRAPHIC/BATHYMETRIC MASSES AND CRUSTAL PARAMETERS IN GRAVITY FIELD MODELING

Matej Varga, Sime Skocic, Tomislav Basic

Abstract

Topographic and topoisostatic reductions of gravity field measurements are important in geodesy and geophysics. Reductions filter high frequencies from gravity which are then used in geoid modelling or investigations of the EarthпїЅs structure. Practical computations of reductions are performed using digital elevation/bathymetric models as input data and some approximation scheme of the EarthпїЅs structure. The main parameters describing the EarthпїЅs structure are crustal, mantle and water density, density contrast, and Moho depths. Traditionally, standard global values for parameters are used which in local areas significantly differ from reality. As EarthпїЅs topography and structure largely varies, it is of interest to know the effects and differences caused by using different input models and parameters describing the EarthпїЅs topography and structure. Results presented in this paper are topographic and topoisostatic corrections on gravity anomalies and geoid undulations calculated for the wider Croatian area using GTOPO30, GMTED2010, GEBCO2014, SRTM15+ and SRTM30+ digital elevation and bathymetric models and several arbitrarily chosen parameters describing the EarthпїЅs structure. The study area is suitable because it includes topographic changes from simple and flat to mountainous and complex terrain. Differences between solutions will point out importance of appropriate selection of the input models and crustal scheme.

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DOI resolver: doi.org/10.5593/sgem2017/22/s09.048

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