Constraints on an intrusive system beneath the Soufriere Hills Volcano, Montserrat, from finite difference modeling of a controlled source seismic experiment
Constraints on an intrusive system beneath the Soufriere Hills Volcano, Montserrat, from finite difference modeling of a controlled source seismic experiment
The SEA-CALIPSO wide-angle seismic tomography experiment revealed a high velocity region beneath the island of Montserrat. Field recordings show a decrease in the amplitude of seismic signals crossing this high velocity region. We constrain the geometry and nature of this attenuating body, by forward modeling of the seismic wave field with a viscoelastic finite-difference method.
We interpret the attenuation observed as caused by a scattering region, which we model as a stochastic perturbation of the velocity field with characteristic length scale of 0.4 km. The scattering region approximately coincides with the top part of the high velocity region identified in the tomographic model and is estimated to have a volume of about 800 km3 . We argue that the scattering is caused by geological heterogeneities corresponding to a system of dikes and sills and to the complex structure of the volcanic edifice.
L00E01
Paulatto, M.
6920a255-855e-4b8d-b5d6-c00b4448ecfd
Minshull, T.A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Henstock, T.J.
27c450a4-3e6b-41f8-97f9-4e0e181400bb
2 February 2010
Paulatto, M.
6920a255-855e-4b8d-b5d6-c00b4448ecfd
Minshull, T.A.
bf413fb5-849e-4389-acd7-0cb0d644e6b8
Henstock, T.J.
27c450a4-3e6b-41f8-97f9-4e0e181400bb
Paulatto, M., Minshull, T.A. and Henstock, T.J.
(2010)
Constraints on an intrusive system beneath the Soufriere Hills Volcano, Montserrat, from finite difference modeling of a controlled source seismic experiment.
Geophysical Research Letters, 37, .
(doi:10.1029/2009GL041805).
Abstract
The SEA-CALIPSO wide-angle seismic tomography experiment revealed a high velocity region beneath the island of Montserrat. Field recordings show a decrease in the amplitude of seismic signals crossing this high velocity region. We constrain the geometry and nature of this attenuating body, by forward modeling of the seismic wave field with a viscoelastic finite-difference method.
We interpret the attenuation observed as caused by a scattering region, which we model as a stochastic perturbation of the velocity field with characteristic length scale of 0.4 km. The scattering region approximately coincides with the top part of the high velocity region identified in the tomographic model and is estimated to have a volume of about 800 km3 . We argue that the scattering is caused by geological heterogeneities corresponding to a system of dikes and sills and to the complex structure of the volcanic edifice.
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Submitted date: 17 November 2009
Published date: 2 February 2010
Organisations:
Ocean and Earth Science
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Local EPrints ID: 150849
URI: http://eprints.soton.ac.uk/id/eprint/150849
ISSN: 0094-8276
PURE UUID: b3604b3d-092c-47fc-8466-79f89fa032bd
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Date deposited: 06 May 2010 15:47
Last modified: 14 Mar 2024 02:44
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M. Paulatto
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