Publication Date:
2017-04-04
Description:
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.
Description:
Published
Description:
718-724
Description:
3.3. Geodinamica e struttura dell'interno della Terra
Description:
3.4. Geomagnetismo
Description:
JCR Journal
Description:
reserved
Keywords:
core–mantle boundary, deformation, rheology, seismic modelling, spectral analysis
;
04. Solid Earth::04.05. Geomagnetism::04.05.02. Geomagnetic field variations and reversals
;
04. Solid Earth::04.07. Tectonophysics::04.07.02. Geodynamics
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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