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Authors: Cheloni, D.*
D'Agostino, N.*
D'Anastasio, E.*
Avallone, A.*
Mantenuto, S.*
Giuliani, R.*
Mattone, M.*
Calcaterra, S.*
Gambino, P.*
Dominici, D.*
Radicioni, F.*
Fastellini, G.*
Title: Coseismic and initial postseismic slip of the 2009 Mw 6.3 l’Aquila earthquake, Italy, from GPS measurements
Title of journal: Geophysical Journal International Fast track
Series/Report no.: 3/181 (2010)
Issue Date: Jun-2010
DOI: 10.1111/j.1365-246X.2010.04584.x
Keywords: satellite geodesy
earthquake source observations
Continental tectonics: extensional
Abstract: Here we report the preliminary results of GPS data inversions for coseismic and initial afterslip distributions of the Mw 6.3 2009 April 6 L’Aquila earthquake. Coseismic displacements of continuous and survey-style GPS sites, show that the earthquake ruptured a planar SW-dipping normal fault with ∼0.6 m average slip and an estimated moment of 3.9 × 1018 Nm. Geodetic data agree with the seismological and geological information pointing out the Paganica fault, as the causative structure of the main shock. The position of the hypocentre relative to the coseismic slip distribution supports the seismological evidence of southeastward rupture directivity. These results also point out that the main coseismic asperity probably ended downdip of the Paganica village at a depth of few kilometres in agreement with the small (1–10 cm) observed surface breaks. Time-dependent post-seismic displacements have been modelled with an exponential function. The average value of the estimated characteristic times for near-field sites in the hanging-wall of the fault is 23.9 ± 5.4 d. The comparison between coseismic slip and post-seismic displacements for the first 60 d after the main shock, shows that afterslip occurred at the edges of the main coseismic asperity with a maximum estimated slip of ∼25 cm and an equivalent seismic moment of 6.5 × 1017 Nm. The activation of the Paganica fault, spatially intermediate between the previously recognized main active fault systems, suggests that strain accumulation in the central Apennines may be simultaneously active on distinct parallel fault systems.
Appears in Collections:04.03.06. Measurements and monitoring
04.03.01. Crustal deformations
04.06.06. Surveys, measurements, and monitoring
04.06.03. Earthquake source and dynamics
04.06.01. Earthquake faults: properties and evolution
Papers Published / Papers in press

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