Some Insights into Topographic,Elastic and Self-gravitation Interaction in Modelling Ground Deformation and Gravity Changes in Active Volcanic Areas |
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Authors: | María Charco José Fernández Francisco Luzón Kristy F Tiampo John B Rundle |
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Institution: | (1) Instituto de Astronomía y Geodesia (CSIC-UCM), Facultad de C. Matemáticas, Universidad Complutense de Madrid, Madrid, Spain;(2) Departamento de Física Aplicada, Universidad de Almería, Almería, Spain;(3) Department of Earth Sciences, University of Western Ontario, London, ON, Canada;(4) Center of Computational Science and Engineering, University of California, Davis, CA 95616, USA |
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Abstract: | Surface displacements and gravity changes due to volcanic sources are influenced by medium properties. We investigate topographic,
elastic and self-gravitation interaction in order to outline the major factors that are significant in data modelling. While
elastic-gravitational models can provide a suitable approximation to problems of volcanic loading in areas where topographic
relief is negligible, for prominent volcanoes the rough topography could affect deformation and gravity changes to a greater
extent than self-gravitation. This fact requires the selection, depending on local relief, of a suitable model for use in
the interpretation of surface precursors of volcanic activity. We use the three-dimensional Indirect Boundary Element Method
to examine the effects of topography on deformation and gravity changes in models of magma chamber inflation/deflation. Topography
has a significant effect on predicted surface deformation and gravity changes. Both the magnitude and pattern of the geodetic
signals are significantly different compared to half-space solutions. Thus, failure to account for topographic effects in
areas of prominent relief can bias the estimate of volcanic source parameters, since the magnitude and pattern of deformation
and gravity changes depend on such effects. |
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Keywords: | Topography self-gravitation displacement gravity change |
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