Alternative gravimetric methodology for isostatic analyses. An example for Bolivian Andes
In this work we present a new, alternative methodology for performing isostatic studies by means of geoid undulations, excluding the use of measured gravity anomalies. An example on Bolivian Andes is presented as case study. Considering a digital elevation model as input data, a theoretical perfec...
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| Autores principales: | , |
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| Formato: | article artículo publishedVersion |
| Lenguaje: | Inglés |
| Publicado: |
Instituto de Fisiografía y Geología
2009
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| Materias: | |
| Acceso en línea: | http://hdl.handle.net/2133/1281 http://hdl.handle.net/2133/1281 |
| Aporte de: |
| Sumario: | In this work we present a new, alternative methodology for performing isostatic studies by means of
geoid undulations, excluding the use of measured gravity anomalies. An example on Bolivian Andes is
presented as case study. Considering a digital elevation model as input data, a theoretical perfectly isostatically
balanced Airy crustal model was constructed for Bolivia. The free-air and the Bouguer anomalies, and the
geoid undulations produced by this theoretical model, were directly evaluated by means of three-dimensional
integration. The “real” geoid undulations were computed from the EGM96 global geopotential model, and
were filtered from long wavelengths by means of a sparse Fourier transform method. The residual “real” geoid
undulations were compared with the theoretical geoid undulations for Bolivian Andes, showing a global
tendency towards isostatic balance, agreeing with previous results obtained using traditional gravimetry.
The free-air and the Bouguer anomalies from the EGM96 residual geoid undulations were also
evaluated and then compared with the anomalies produced by the theoretical model. The Bouguer anomalies
support definitely the results obtained using the geoid undulations while the free-air anomalies, although less
consistently, showed the same global tendency. |
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