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http://hdl.handle.net/2122/5401
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 Classification: | 04. 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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