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

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

2007-07-04

arxiv.org/abs/0707.0638v1

Physics

Geophysics

14 pages, 8 figures, 1 table. It will appear in Geophysical Journal International

Scientific paper

10.1111/j.1365-246X.2007.03443.x

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 (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.

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