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Authors: Boncio, P.* 
Pizzi, A.* 
Brozzetti, F.* 
Pomposo, G.* 
Lavecchia, G.* 
Di Naccio, D.* 
Ferrarini, F.* 
Title: Coseismic ground deformation of the 6 April 2009 L’Aquila earthquake (central Italy, Mw6.3)
Journal: Geophysical Research Letters 
Series/Report no.: /37 (2010)
Publisher: American Geophysical Union
Issue Date: 27-Mar-2010
DOI: 10.1029/2010GL042807
Keywords: 6 April 2009 L’Aquila earthquake
Coseismic ground deformation
Subject Classification04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution 
Abstract: We provide field data of coseismic ground deformation related to the 6 April Mw 6.3 L’Aquila normal faulting earthquake. Three narrow fracture zones were mapped: Paganica‐Colle Enzano (P‐E), Mt. Castellano‐Mt. Stabiata (C‐S) and San Gregorio (SG). These zones define 13 km of surface ruptures that strike at 130–140°. We mapped four main types of ground deformation (free faces on bedrock fault scarps, faulting along synthetic splays and fissures with or without slip) that are probably due to the near‐surface lithology of the fault walls and the amount of slip that approached the surface coseismically. The P‐E and C‐S zones are characterized by downthrow to the SW (up to 10 cm) and opening (up to 12 cm), while the SG zone is characterized only by opening. Afterslip throw rates of 0.5–0.6 mm/day were measured along the Paganica fault, where paleoseismic evidence reveals recurring paleo‐earthquakes and post‐24.8 kyr slip‐rate ≥ 0.24 mm/yr.
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