Camacho, AG, A.G. and González Montesinos, Fuensanta and Vieira, Ricardo (2000) Gravity inversion by means of growing bodies. Geophysics, 65 (1). pp. 95-101. ISSN 0016-8033
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This paper presents a gravity inversion method for determining the volumes of bodies with pre-established density contrasts. The method works step-by-step on a prismatic partition of the subsurface volume, expanding the anomalous bodies to fit the observed gravity values in a systematic exploration of model possibilities. The process is treated in a 3-D context; at the same time, it can determine a simple regional trend. Moreover, positive and negative density contrasts are simultaneously accepted. The solution is obtained by a double condition: (1) the e(2)-fitness to the observed gravity data (model fitness) and (2) the minimization of the total (weighted) anomalous mass (model smoothness). A positive parameter is used to balance the two minimization terms. The method is applied to a simulated example and also to a real example: the volcanic island of Gran Canaria (Canary Islands, Spain). In both cases, the results obtained show the possibilities of the method.
|Uncontrolled Keywords:||Canary-Islands; Gran-Canaria; Geochemistry & Geophysics|
|Subjects:||Sciences > Physics > Geophysics|
Bosshard, E., and MacFarlane,D.J., 1970, Crustal structure of theWestern Canary Islands from seismic refraction and gravity data: J. Geophys. Res., 75, 4901–4918.
Camacho, A. G., Montesinos, F. G., and Vieira, R., 1997, A threedimensional gravity inversion applied to Sao Miguel Island (Azores): J. Geophys. Res., 102, 7705–7715.
Moritz, H., 1980, Advanced physical geodesy: HerbertWichmannVerlag.
Pedersen, L. B., 1979, Constrained inversion of potential field data: Geophys. Prosp., 27, 726–748.
Pérez-Torrado, F.J., Marti, J., Mangas, J., and Day, S., 1997, Ignimbrites of the Roque Nublo group, Gran Canaria, Canary Islands: Bull. Volcanol., 58, 647–654.
Pick, M., Picha, J., and Vysk ˆ ocil,V., 1973, Theory of the Earth’s gravity field: Elsevier Science Publ. Co.
René, R. M., 1986, Gravity inversion using open, reject, and “shapeof- anomaly” fill criteria: Geophysics, 51, 988–994.
Rothman, D. H., 1985, Nonlinear inversion, statistical mechanics, and residual statics estimation: Geophysics, 50, 2784–2796.
Silva, J.B.C. and Hohmann,G.W., 1983, Nonlinear magnetic inversion using a random search method: Geophysics, 46, 1645–1658.
Tarantola, A., 1988, The inverse problem theory: Methods for data fitting and model parameter estimation: Elsevier Science Publ. Co.
Zidarov, D., 1990, Inverse gravimetric problem in geoprospecting and geodesy: Elsevier Science Publ. Co.
|Deposited On:||18 Jul 2012 12:59|
|Last Modified:||18 Jul 2012 12:59|
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