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Authors: Hautmann, S.* 
Gottsmann, J.* 
Sparks, R. S. J.* 
Costa, A.* 
Melnik, O.* 
Voight, B.* 
Title: Modelling ground deformation caused by oscillating overpressure in a dyke conduit at Soufrière Hills Volcano, Montserrat
Journal: Tectonophysics 
Series/Report no.: /471 (2009)
Publisher: Elsevier
Issue Date: 2009
DOI: 10.1016/j.tecto.2008.10.021
Keywords: Soufrière Hills Volcano
Dyke conduit
Finite Element Model
Ground deformation
Subject Classification04. Solid Earth::04.07. Tectonophysics::04.07.08. Volcanic arcs 
04. Solid Earth::04.08. Volcanology::04.08.08. Volcanic risk 
05. General::05.01. Computational geophysics::05.01.03. Inverse methods 
Abstract: A dyke conduit has been shown to be a realistic model for the shallow magmatic feeder system for the dome forming eruption at Soufrière Hills Volcano, Montserrat. Here we use a three-dimensional Finite Element model to examine the ground deformation that can be expected due to the pressurization of a dyke conduit. We find that the generated deformation has a bilateral symmetry with nearly no displacement in the direction of dyke strike, and a maximal ground deformation about 1 km away from the vent in the perpendicular direction. Resultant surface deformation is mainly triggered by the upper part of the feeder system, where the dyke opens into a cylindrical conduit. We apply our deformation model to investigate tilt data collected in 1997 in order to infer the orientation of the dyke. We obtain a best-fit for a NNW–SSE trending dyke, which matches observations of the ground displacement field obtained by differential GPS and the alignment of main structural geologic features of southern Montserrat.
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