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New appraisals of the gravitational and deformation effects of huge earthquakes.

Sabadini R.
  Venerdì 15/09   09:00 - 12:00   Aula A210   IV - Geofisica e fisica dell'ambiente
Developments in the physical modelling of the Earth's interior and space geodesy make possible nowadays to exploit the gravity signature and deformation patterns caused by the huge megathrust earthquakes with moment magnitude Mw higher than 9.0, the 2004 Sumatra and 2011 Tohoku-Oki ones. I show how GRACE and GPS data allows us to gain insight into mass redistribution, inner volume variations, gravity perturbations and surface deformation affecting areas and volumes larger than those embedding the gouge of the earthquakes, including the slip distribution over the fault surface. These results are based on the most realistic self-gravitating, compressible Earth's models, stratified in terms of density and rheological properties.