Effects of mechanical layering on volcano deformation

Details Effects of mechanical layering on volcano deformation Effects of mechanical layering on volcano deformation

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007geoji.170..952m&link_type=abstract

Geophysical Journal International, Volume 170, Issue 6807, pp. 952-958.

Astronomy and Astrophysics

Astronomy

15

Crustal Deformation, Finite-Element Methods, Galápagos Islands, Layered Media, Satellite Geodesy, Volcanic Activity

Scientific paper

The migration and accumulation of magma beneath volcanoes often causes surface displacements that can be measured by geodetic techniques. Usually, deformation signals are explained using models with uniform mechanical properties. In this paper, we study surface displacements due to magma chamber inflation, using heterogeneous finite element models. We first present a systematic analysis of the influence of mechanical layering, showing that the stiffness contrast significantly affects the entity and the pattern of vertical and radial displacements. Second, as an example we apply the models to interpret ground displacements at Darwin volcano (Galápagos Islands) as revealed by InSAR data in the period 1992-1998. The considered models suggest that geodetic data interpreted using homogeneous models leads to underestimation of the source depth and volume change. Thus, we propose correction factors for the source parameters estimated by homogeneous models, in order to consider a range of variation due to mechanical layering as analysed in this study. The effect of the mechanical heterogeneities affects the correct understanding of geodetic data and also influences the evaluation of a volcanic hazard potential.

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