Enhancing Inverse Analyses of Volcano Deformation Data with Multidisciplinary Information using Finite Element Models
Abstract
The upward migration of magma controls the eruption cycle of an active volcano. The specific characteristics of this migration (the impulse) and surrounding domain of the volcano produce a specific deformation signature (the response) at the Earth's surface. Forward models of such a system, with given magma migration characteristics and domain configurations, predict the surface deformation. In the field of Geodesy, we are faced with the much more challenging problem of using inverse models of geodetic data to estimate key controlling parameters that characterize the inaccessible magma migration at depth. The resulting estimates are strongly controlled by the geometric configuration and distribution of materials that host the migration and modulate how the magma migration impulse translates to the deformational response of the Earth's surface. Finite element models (FEMs) allow us to leverage our inverse analyses of geodetic data and formally integrate other types of field and laboratory information, such as seismic tomography and petrology experimental results, to provide more synoptic interpretations of volcano deformation. We present a systematic and general-purpose approach to quantitatively simulate geodetic data with FEMs in the framework of a deformation modelling protocol. This approach will (1) Address the design and execution of FEMs that can account for the geophysical complexity of a volcano deformational system and (2) Define techniques for including FEMs in both linear and nonlinear inverse methods to characterize a magmatic system based on observed geodetic data. With these techniques, researchers can quantify prediction sensitivities to model design specifications and estimate magmatic migration and storage within the complex domains of active volcanoes.
- Publication:
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AGU Fall Meeting Abstracts
- Pub Date:
- December 2019
- Bibcode:
- 2019AGUFM.G31A..08M
- Keywords:
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- 1240 Satellite geodesy: results;
- GEODESY AND GRAVITY;
- 1295 Integrations of techniques;
- GEODESY AND GRAVITY;
- 8485 Remote sensing of volcanoes;
- VOLCANOLOGY