Publication Date:
2017-04-04
Description:
The interpretation of geodetic data in volcanic areas is usually based on analytical deformation
models. Although numerical finite element (FE) modelling allows realistic features such as
topography and crustal heterogeneities to be included, the technique is not computationally
convenient for solving inverse problems using classical methods. In this paper, we develop a
general tool to perform inversions of geodetic data by means of 3-D FE models. The forward
model is a library of numerical displacement solutions, where each entry of the library is the
surface displacement due to a single stress component applied to an element of the grid. The
final solution is aweighted combination of the six stress components applied to a single elementsource.
The pre-computed forward models are implemented in a global search algorithm,
followed by an appraisal of the sampled solutions. After providing extended testing, we apply
the method to model the 1993–1997 inflation phase at Mt Etna, documented by GPS and EDM
measurements.We consider four different forward libraries, computed in models characterized
by homogeneous/heterogeneous medium and flat/topographic free surface. Our results suggest
that the elastic heterogeneities of the medium can significantly alter the position of the inferred
source, while the topography has minor effect.
Description:
Published
Description:
873-884
Description:
3.6. Fisica del vulcanismo
Description:
JCR Journal
Description:
reserved
Keywords:
Numerical solutions;
;
Inverse theory
;
Crustal structure;
;
Mechanics, theory, and modelling;
;
Volcano monitoring
;
04. Solid Earth::04.08. Volcanology::04.08.06. Volcano monitoring
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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