Core-mantle boundary deformations and J2 variations resulting from the 2004 Sumatra earthquake

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dc.creatorCannelli, V.
dc.creatorMelini, D.
dc.creatorDe Michelis, P.
dc.creatorPiersanti, A.
dc.creatorFlorindo, F.
dc.date2007-07-04
dc.date.accessioned2026-07-07T08:13:58Z
dc.date.available2026-07-07T08:13:58Z
dc.descriptionThe deformation at the core-mantle boundary produced by the 2004 Sumatra earthquake is investigated by means of a semi-analytic theoretical model of global coseismic and postseismic deformation, predicting a millimetric coseismic perturbation over a large portion of the core-mantle boundary. Spectral features of such deformations are analysed and discussed. The time-dependent postseismic evolution of the elliptical part of the gravity field (J2) is also computed for different asthenosphere viscosity models. Our results show that, for asthenospheric viscosities smaller than 10^18 Pa s, the postseismic J2 variation in the next years is expected to leave a detectable signal in geodetic observations.
dc.description14 pages, 8 figures, 1 table. It will appear in Geophysical Journal International
dc.identifierhttps://arxiv.org/abs/0707.0638
dc.identifierhttp://arxiv.org/abs/0707.0638
dc.identifierdoi:10.1111/j.1365-246X.2007.03443.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/132959
dc.subjectGeophysics
dc.titleCore-mantle boundary deformations and J2 variations resulting from the 2004 Sumatra earthquake
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