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Pomposo, G.
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- PublicationRestrictedActive faulting in the Maiella massif (central Apennines, Italy)(2010)
; ; ; ; ; ; ; ; ; ; ;Pizzi, A.; Università degli studi di Chieti "G. d'Annunzio" ;Falcucci, E.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Gori, S.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Galadini, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma1, Roma, Italia ;Messina, P.; CNR-IGAG ;Di Vincenzo, M.; Università degli studi di Chieti "G. d'Annunzio" ;Esestime, P.; Università degli studi di Chieti "G. d'Annunzio" ;Giaccio, B.; CNR-IGAG ;Pomposo, G.; Università degli studi di Chieti "G. d'Annunzio" ;Sposato, A.; CNR-IGAG; ; ; ; ; ; ; ; ; The Maiella Massif is the outermost carbonate anticline of the central Apennines, and it is considered as the epicentral area of two major historical earthquakes: the 1706 (Maw = 6.60) and 1933 (Maw = 5.7) events. Geological and geomorphological surveys have defined the geometry and kinematics of the Late Pleistocene-Holocene faults in the Maiella area. These faults show mainly normal kinematics and are organised as a complex dextral en-echelon fault system. The north-eastern fault (the Palena fault) trends N110°-120° and cuts the southern sector of the Maiella Massif transversally, displacing debris deposits that have been radiocarbon dated to 36,300 ±1,300 yr BP. The southwestern fault affects the western slope of Mt. Porrara and is composed of three NNW-SS-oriented en-echelon segments, placing the Mesozoic-Cenozoic carbonate bedrock in contact with Late Pleistocene continental deposits. These normal faults of the Maiella area represent the eastern-most extensional structures of the chain. Geomorphic evidence suggests that the onset of the fault activity probably occurred more recently than along other central Apennine Quaternary faults. This supports the traditional view of an outward (eastward) propagating extensional deformation during the Pliocene-Quaternary. Moreover, the evidence of re-use of pre-existing faults in the cases investigated indicates that this migration of the extensional domain generally occurs through the reactivation of faults inherited from previous tectonic phases, the geometry for which is consistent with the present (N)NE-(S)SW direction of extension. Moreover, the structural framework appears to have been conditioned by the NNE-SSW crustal Ortona-Roccamonfina Line, the present expression of which is seen in a complex dextral oblique fault zone of Late Pliocene age (i.e., the Sangro-Volturno thrust zone). Finally, the integration of our field structural data with the subsurface data available for the on-shore Periadriatic area have allowed the identification of a more external zone (Apulian foreland) that is deformed by lateral and extensional active structures, and an inner zone east of the Maiella Massif that is affected only by the most recent buried thrusts of the chain. This evidence suggests no kinematic interactions at the upper crustal level between the active oblique faulting of the Apulian foreland and the extensional structures of the Apennine chain.244 39 - PublicationRestrictedCoseismic ground deformation of the 6 April 2009 L’Aquila earthquake (central Italy, Mw6.3)(2010-03-27)
; ; ; ; ; ; ; ;Boncio, P.; Dipartimento di Scienze della Terra, “G. d’Annunzio”Università ;Pizzi, A.; Dipartimento di Scienze della Terra, “G. d’Annunzio”Università ;Brozzetti, F.; Dipartimento di Scienze della Terra, “G. d’Annunzio”Università ;Pomposo, G.; Dipartimento di Scienze della Terra, “G. d’Annunzio”Università ;Lavecchia, G.; Dipartimento di Scienze della Terra, “G. d’Annunzio”Università ;Di Naccio, D.; Dipartimento di Scienze della Terra, “G. d’Annunzio”Università ;Ferrarini, F.; Dipartimento di Scienze della Terra, “G. d’Annunzio”Università; ; ; ; ; ; 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.244 47 - PublicationRestrictedThe April 2009 Aquila (central Italy) seismic sequence (Mw6.3): A preliminary seismotectonic picture,(Nova Science Publishers, New York, 2011)
; ; ; ; ; ; ; ; ;Lavecchia, G.; Dipartimento di Scienze della Terra, “G. d’Annunzio”Università ;Boncio, P.; Dipartimento di Scienze della Terra, “G. d’Annunzio”Università ;Brozzetti, F.; Dipartimento di Scienze della Terra, “G. d’Annunzio”Università ;de Nardis, R.; Dipartimento della Protezione Civile ;Di Naccio, D.; Dipartimento di Scienze della Terra, Univ. “G. d’Annunzio” ;Ferarini, F.; Dipartimento di Scienze della Terra, “G. d’Annunzio”Università ;Pizzi, A.; Dipartimento di Scienze della Terra, “G. d’Annunzio”Università ;Pomposo, G.; Dipartimento di Scienze della Terra, “G. d’Annunzio”Università; ; ; ; ; ; ; ; ; ;Guarnieri, P.; Università di CataniaOn 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.273 54