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Authors: Cirella, A.* 
Piatanesi, A.* 
Cocco, M.* 
Tinti, E.* 
Scognamiglio, L.* 
Michelini, A.* 
Lomax, A.* 
Boschi, E.* 
Title: Rupture history of the 2009 L’Aquila (Italy) earthquake from non-linear joint inversion of strong motion and GPS data
Issue Date: 6-Oct-2009
Series/Report no.: /36 (2009)
DOI: 10.1029/2009GL039795
Keywords: 2009 L'Aquila earthquake
kinematic inversion
joint inversion
Subject Classification04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics 
Abstract: We image the rupture history of the 2009 L’Aquila (Central Italy) earthquake using a nonlinear joint inversion of strong motion and GPS data. This earthquake ruptured a normal fault striking along the Apennines axis and dipping to the SW. The inferred slip distribution is heterogeneous and characterized by a small, shallow slip patch located up-dip from the hypocenter (9.5 km depth) and a large, deeper patch located southeastward. The rupture velocity is larger in the up-dip than in the along-strike direction. This difference can be partially accounted by the crustal structure, which is characterized by a high velocity layer above the hypocenter and a lower velocity below. The latter velocity seems to have affected the along strike propagation since the largest slip patch is located at depths between 9 and 14 km. The imaged slip distribution correlates well with the on-fault aftershock pattern as well as with mapped surface breakages.
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