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Authors: Cannelli, V.* 
Melini, D.* 
De Michelis, P.* 
Piersanti, A.* 
Florindo, F.* 
Title: Core–mantle boundary deformations and J 2 variations resulting from the 2004 Sumatra earthquake
Issue Date: 2007
Series/Report no.: / 170 (2007)
DOI: 10.1111/j.1365-246X.2007.03443.x
Keywords: core–mantle boundary, deformation, rheology, seismic modelling, spectral analysis
Subject Classification04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals 
04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics 
Abstract: The 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 (J 2) is also computed for different asthenosphere viscosity models. Our results show that, for asthenospheric viscosities smaller than 1018 Pa s, the postseismic J 2 variation in the next years is expected to leave a detectable signal in geodetic observations.
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