Development of a Synthetic Earth Gravity Model by 3D mass optimisation based on forward modelling
Several previous Synthetic Earth Gravity Model (SEGM) simulations are based on existing information about the Earth’s internal mass distribution. However, currently available information is insufficient to model the Earth’s anomalous gravity field on a global scale. The low-frequency information is...
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| Format: | Journal Article |
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Terra Scientific Publishing
2012
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| Online Access: | http://hdl.handle.net/20.500.11937/42778 |
| _version_ | 1848756512855425024 |
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| author | Fellner, J. Kuhn, Michael Featherstone, Will |
| author_facet | Fellner, J. Kuhn, Michael Featherstone, Will |
| author_sort | Fellner, J. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Several previous Synthetic Earth Gravity Model (SEGM) simulations are based on existing information about the Earth’s internal mass distribution. However, currently available information is insufficient to model the Earth’s anomalous gravity field on a global scale. The low-frequency information is missing when modelling only topography, bathymetry and crust (including the Mohorovičić discontinuity), but the inclusion of information on the mantle and core does not seem to significantly improve this situation. This paper presents a method to determine a more realistic SEGM by considering simulated 3D mass distributions within the upper mantle as a proxy for all unmodelled masses within the Earth.The aim is to improve an initial SEGM based on forward gravity modelling of the topography, bathymetry and crust such that the missing low-frequency information is now included. The simulated 3D mass distribution has been derived through an interactive and iterative mass model optimisation algorithm, which minimises geoid height differences with respect to a degree-360 spherical harmonic expansion of the EGM2008 global external gravity field model. We present the developed optimisation algorithm by applying it to the development of a global SEGM that gives a reasonably close fit to EGM2008, and certainly closer than a SEGM based only on the topography, bathymetry and crust. |
| first_indexed | 2025-11-14T09:13:23Z |
| format | Journal Article |
| id | curtin-20.500.11937-42778 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T09:13:23Z |
| publishDate | 2012 |
| publisher | Terra Scientific Publishing |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-427782017-09-13T15:51:40Z Development of a Synthetic Earth Gravity Model by 3D mass optimisation based on forward modelling Fellner, J. Kuhn, Michael Featherstone, Will forward gravity modelling global source model 3D mass optimisation Synthetic Earth Gravity Model (SEGM) Several previous Synthetic Earth Gravity Model (SEGM) simulations are based on existing information about the Earth’s internal mass distribution. However, currently available information is insufficient to model the Earth’s anomalous gravity field on a global scale. The low-frequency information is missing when modelling only topography, bathymetry and crust (including the Mohorovičić discontinuity), but the inclusion of information on the mantle and core does not seem to significantly improve this situation. This paper presents a method to determine a more realistic SEGM by considering simulated 3D mass distributions within the upper mantle as a proxy for all unmodelled masses within the Earth.The aim is to improve an initial SEGM based on forward gravity modelling of the topography, bathymetry and crust such that the missing low-frequency information is now included. The simulated 3D mass distribution has been derived through an interactive and iterative mass model optimisation algorithm, which minimises geoid height differences with respect to a degree-360 spherical harmonic expansion of the EGM2008 global external gravity field model. We present the developed optimisation algorithm by applying it to the development of a global SEGM that gives a reasonably close fit to EGM2008, and certainly closer than a SEGM based only on the topography, bathymetry and crust. 2012 Journal Article http://hdl.handle.net/20.500.11937/42778 10.5047/eps.2011.07.012 Terra Scientific Publishing fulltext |
| spellingShingle | forward gravity modelling global source model 3D mass optimisation Synthetic Earth Gravity Model (SEGM) Fellner, J. Kuhn, Michael Featherstone, Will Development of a Synthetic Earth Gravity Model by 3D mass optimisation based on forward modelling |
| title | Development of a Synthetic Earth Gravity Model by 3D mass optimisation based on forward modelling |
| title_full | Development of a Synthetic Earth Gravity Model by 3D mass optimisation based on forward modelling |
| title_fullStr | Development of a Synthetic Earth Gravity Model by 3D mass optimisation based on forward modelling |
| title_full_unstemmed | Development of a Synthetic Earth Gravity Model by 3D mass optimisation based on forward modelling |
| title_short | Development of a Synthetic Earth Gravity Model by 3D mass optimisation based on forward modelling |
| title_sort | development of a synthetic earth gravity model by 3d mass optimisation based on forward modelling |
| topic | forward gravity modelling global source model 3D mass optimisation Synthetic Earth Gravity Model (SEGM) |
| url | http://hdl.handle.net/20.500.11937/42778 |