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Postseismic stress diffusion associated with Sumatra earthquake
Author(s)
Type
Poster session
Language
English
Status
Unpublished
Conference Name
Issued date
April 15, 2007
Conference Location
Vienna - Austria
Abstract
The giant megathrust occurred on 26th December 2004 off the west coast of northern
Sumatra perturbated the stress field configuration over a wide area surrounding the event source. By means of a viscoelastic spherical model of global postseismic deformation and a new computational finite elements package (FEMSA) we perform an
analysis of the stress diffusion following the earthquake near and far from the Sunda
trench. We evaluated the stress changes due to the Sumatra earthquake by projecting
the Coulomb stress over the sequence of aftershocks taken from various catalogues in
a time window spanning about two years and then we considered the possibility that the Sumatra event could have affected subsequent events very far from the source.
Sumatra perturbated the stress field configuration over a wide area surrounding the event source. By means of a viscoelastic spherical model of global postseismic deformation and a new computational finite elements package (FEMSA) we perform an
analysis of the stress diffusion following the earthquake near and far from the Sunda
trench. We evaluated the stress changes due to the Sumatra earthquake by projecting
the Coulomb stress over the sequence of aftershocks taken from various catalogues in
a time window spanning about two years and then we considered the possibility that the Sumatra event could have affected subsequent events very far from the source.
References
Casarotti E., Piersanti A. Lucente F. P. and Boschi E., 2001. Global Postseismic stress diffusion and fault interaction at long distances, Earth and Planetary Science Letters 75 – 84.
Piersanti A., Spada G., Sabadini R. and Bonafede M., 1995. Global post-seismic deformation, Geophys. J. Int. 120, 544-566.
Volpe M., Melini D., Piersanti A., 2007. FEMSA: a finite element simulation tool for quasi-satic seismic deformation modeling, Annals of Geophysics (in press).
Piersanti A., Spada G., Sabadini R. and Bonafede M., 1995. Global post-seismic deformation, Geophys. J. Int. 120, 544-566.
Volpe M., Melini D., Piersanti A., 2007. FEMSA: a finite element simulation tool for quasi-satic seismic deformation modeling, Annals of Geophysics (in press).
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