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Authors: Lavecchia, G.* 
Boncio, P.* 
Brozzetti, F.* 
de Nardis, R.* 
Di Naccio, D.* 
Ferarini, F.* 
Pizzi, A.* 
Pomposo, G.* 
Title: The April 2009 Aquila (central Italy) seismic sequence (Mw6.3): A preliminary seismotectonic picture,
Issue Date: 2011
Publisher: Nova Science Publishers, New York
ISBN: 978-1-60876-147-0
Keywords: L’Aquila, Apennines, central Italy
seismogenic source
normal fault
fault segmentation
Subject Classification04. Solid Earth::04.07. Tectonophysics::04.07.07. Tectonics 
Abstract: On April 6, 2009, an Mw 6.3 earthquake struck the town of L’Aquila in the Abruzzo region in central Italy. It was followed by a long seismic crisis with other four events with Mw between 5.1 and 5.6. Seismological and geological data point out an upper crust extensional stress field with an average WSW-ENE tensional axis. In the course of the seismic sequence, two distinct en échelon fault sources were activated: first, the SW-dipping Paganica normal fault, which is associated with the Mw 6.3 event; and, subsequently, the southern part of the WSW-dipping Gorzano normal fault.Co-seismic ground deformation (open fissures, en échelon cracks and shear planes with centimetric downthrows) was surveyed for ~ 13 km along the Paganica fault. The integration of the information from this last Italian earthquake with the previous seismotectonic background has allowed us to further detail the 3-D shape and the size of some of the individual seismogenic sources of the Apennine active extensional belt.
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