HR: 0800h
AN: G31C-0815    [Abstracts]
TI: CURTIN SYNTHETIC EARTH GRAVITY FIELD MODEL (CurtinSEGM) - A GLOGAL FORWARD GRAVITY FIELD MODEL
AU: * Kuhn, M
EM: M.Kuhn@curtin.edu.au
AF: Western Australian Centre for Geodesy, Curtin University of Technology, GPO Box U1987, Perth, WA 6845 Australia
AU: Featherstone, W E
EM: W.Featherstone@curtin.edu.au
AF: Western Australian Centre for Geodesy, Curtin University of Technology, GPO Box U1987, Perth, WA 6845 Australia
AB: Curtin Synthetic Gravity Field Model (CurtinSEGM) describes the Earth's gravity field by forward gravity modelling using mass-density information of topography, bathymetry (JGP95E), crust (Crust 2.0) and mantle (S12WM13). CurtinSEGM is parameterised by a set of fully normalised spherical harmonic coefficients for the disturbing potential and the corresponding geoid height. Although it is a synthetic (simulated) gravity field model the aim of CurtinSEGM is to represent the Earth's gravity field as realistic as possible. Therefore it also can be used for geophysical interpretation of the models used to describe the global mass-density distribution. On a global scale CurtinSEGM represents the general structure of the observed gravity field implied by the EGM96 geopotential model. However in some regions (e.g. Bay of Bengal) the model shows greater differences to EGM96, which perhaps can be attributed mainly to mass-density anomalies in the upper to middle mantle. This paper describes the construction of CurtinSEGM and presents numerical results for the geoid height and (free-air) gravity anomalies as induced by the model. The agreement/disagreement with the observed gravity field (EGM96) gives an additional insight in possible supporting mechanisms for these structures, as well as the capability of obtaining the (external) gravity field by forward gravity field modelling only.
DE: 1212 Earth's interior--composition and state (8105)
DE: 1234 Regional and global gravity anomalies and Earth structure
DE: 1299 General or miscellaneous
SC: Geodesy [G]
MN: 2004 AGU Fall Meeting