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http://hdl.handle.net/2122/5659
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 | Journal: | Geophysical Research Letters | Series/Report no.: | /36 (2009) | Publisher: | Agu | Issue Date: | 6-Oct-2009 | DOI: | 10.1029/2009GL039795 | Keywords: | 2009 L'Aquila earthquake kinematic inversion joint inversion |
Subject Classification: | 04. 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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