Pure and Applied Geophysics

, Volume 164, Issue 4, pp 865–878 | Cite as

Some Insights into Topographic, Elastic and Self-gravitation Interaction in Modelling Ground Deformation and Gravity Changes in Active Volcanic Areas

  • María Charco
  • José Fernández
  • Francisco Luzón
  • Kristy F. Tiampo
  • John B. Rundle
Article

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.

Keywords

Topography self-gravitation displacement gravity change 

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Copyright information

© Birkhäuser Verlag, Basel, 2007

Authors and Affiliations

  • María Charco
    • 1
  • José Fernández
    • 1
  • Francisco Luzón
    • 2
  • Kristy F. Tiampo
    • 3
  • John B. Rundle
    • 4
  1. 1.Instituto de Astronomía y Geodesia (CSIC-UCM), Facultad de C. MatemáticasUniversidad Complutense de MadridMadridSpain
  2. 2.Departamento de Física AplicadaUniversidad de AlmeríaAlmeríaSpain
  3. 3.Department of Earth SciencesUniversity of Western OntarioLondonCanada
  4. 4.Center of Computational Science and EngineeringUniversity of CaliforniaDavisUSA

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