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Title:Moment tensor inversion of explosive long period events recorded on Arenal volcano, Costa Rica, constrained by synthetic tests
Authors:Davi, R., G.S. O'Brien, I. Lokmer, C.J. Bean, P. Lesage, M.M. Mora, 2010
Abstract: In order to constrain the moment tensor solution of an explosive seismic event recorded on Arenal volcano, Costa Rica, we perform tests using synthetic data. These data are generated using a 3D model including the topography of the volcano and the best estimation of the velocity model available for Arenal. Solutions for (i) the moment tensor components, and (ii) the moment tensor plus single forces, are analyzed. When noisy data and mislocated sources are used in the inversion, spurious single forces are easily generated in the solution for the moment tensor components plus single forces. Forces also appear when the inversion is performed using an explosive event recorded on Arenal in 2005. Synthetic tests indicate that these forces might be spurious. However the mechanism is correctly retrieved by the inversion in both solutions. The ability to recover the explosive mechanism for the 2005 event combined with the interpretative aids from the synthetics tests will enable us to invert for the large variation in events observed on Arenal.
ICHEC Project:Seismic source modelling and propagation in complex 3D Earth models
Publication:Journal of Volcanology and Geothermal Research 194, Issue 4, 189-200
URL: http://dx.doi.org/doi:10.1016/j.jvolgeores.2010.05.012
Keywords: Arenal volcano moment tensor inversion single forces synthetic tests
Status: Published

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