Constraints on an intrusive system beneath the Soufriere Hills Volcano, Montserrat, from finite difference modeling of a controlled source seismic experiment
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, L00E01. (doi:10.1029/2009GL041805).
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.
|Subjects:||Q Science > QE Geology
T Technology > TA Engineering (General). Civil engineering (General)
|Divisions:||University Structure - Pre August 2011 > School of Ocean & Earth Science (SOC/SOES)
|Date Deposited:||06 May 2010 15:47|
|Last Modified:||08 Jun 2012 12:46|
|Contributors:||Paulatto, M. (Author)
Minshull, T.A. (Author)
Henstock, T.J. (Author)
|Date:||2 February 2010|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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