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|Authors: ||Volpe, Manuela*|
|Title: ||Linear inversion of GPS data of the 2009 L'Aquila earthquake by means of a High resolution 3D finite element approach|
|Issue Date: ||13-Dec-2010|
|Keywords: ||Fault inversion|
finite element method
|Abstract: ||The L'Aquila earthquake (Mw 6.3) occurred on April 6th at 01:32 UTC in the Central Appennines at a depth of about 9 km and was felt all over the central Italy. The main shock was preceded by a long seismic sequence started several months before and was followed by thousands of aftershocks, some of them with Mw>4.
In this work we present a 3D Finite Element (FE) study of the co-seismic deformation field produced by the L'Aquila earthquake and investigated the slip distribution on the fault.
Our approach is based on a fully 3D parametrization of the spatial domain by means of a high resolution hexahedral mesh, discretized using 20-nodes brick elements. The element horizontal size is biased from 300 m to 2-3 km using the paving meshing algorithm in combination with an appropriate adaptive sizing function. Real surface topography (500 m) and rheological heterogeneities, deduced from a vp/vs travel time tomographic model, were incorporated within the model.
The seismic source has been modeled as a normal fault plane having an heterogeneous moment release. We first computed the co--seismic deformation field by a direct simulation and then the Green's functions, to retrieve the slip distribution on the fault by linear inversion of different GPS datasets. Our results show that the adoption of a realistic 3D domain has a sensible impact on the rupture slip distribution, confirming that a simple halfspace approach introduces some trade-off between domain homogeneity and source complexity.|
|Appears in Collections:||05.01.03. Inverse methods|
04.06.03. Earthquake source and dynamics
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