Plio-Quaternary changes of the normal fault architecture in the central Apennines (Italy). (Articolo in rivista)

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  • Plio-Quaternary changes of the normal fault architecture in the central Apennines (Italy). (Articolo in rivista) (literal)
Anno
  • 2001-01-01T00:00:00+01:00 (literal)
Alternative label
  • Galadini F., Messina P. (2001)
    Plio-Quaternary changes of the normal fault architecture in the central Apennines (Italy).
    (literal)
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  • Galadini F., Messina P. (literal)
Pagina inizio
  • 321 (literal)
Pagina fine
  • 344 (literal)
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  • Geodinamica Acta Impact Factor 0.978 (literal)
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  • 14 (literal)
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  • GEODINAMICA ACTA Impact Factor 0.978 (literal)
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  • The use of geological data aimed at defining the fault characteristics necessary to predict the fault behaviour in a time interval of social interest has increased in the last years. The definition of the fault geometry and kinematics is a fundamental topic for seismic hazard assessment. However, the collection of reliable geological data in this perspective may be very difficult in evolving young orogens affected by changes in the structural architecture during time spans of hundred thousand years. In such cases, in fact, the imprinting of the previous tectonic regime is usually more discernible than that related to the younger regime and only detailed fieldwork permits to cast light on the characteristics of the active faults. These difficulties are well shown by five cases of fault history related to the central Apennines (Italy). In all the investigated cases, significant Quaternary changes in both fault geometry and kinematics have been observed. All geometric and kinematic changes affected the described faults during the Quaternary and only a thorough knowledge of their occurrence prevents the possibility to infer wrong conclusions on the fault characteristics which may have implications in seismotectonic and hazard evaluations. (literal)
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  • ISI Web of Science (WOS) (literal)
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  • CNR - IGAG (literal)
Titolo
  • Plio-Quaternary changes of the normal fault architecture in the central Apennines (Italy). (literal)
Abstract
  • The definition of the active fault geometry and kinematics in young evolving orogens may be difficult owing to changes in the structural architecture which may occur with a frequence of few hundred thousand years. Cases from the central Apennines well illustrate this problem. The Avezzano-Bussi and Vallelonga-Salto Valley fault systems (65 and 85 km long, respectively) show clear evidence of Pliocene-early Pleistocene activity and have been responsible for the formation of intermontane basins.Available geological data, however, indicate that only minor segments (the Tre Monti and Trasacco faults, both 7 km long) of the mentioned faults have to be considered active during the late Pleistocene-Holocene, as faults accommodating minor deformations inside an intermontane basin. The L’Aquila fault system underwent significant geometrical and kinematic modifications during the Quaternary, with the reactivation of minor portions of parallel normal faults to draw a new system of en-echelon normal-oblique left-lateral faults. The Laga Mts. fault experienced an along-fault activity migration. The portion of the fault which was active earlier during the Quaternary shows a significant decrease or end of the activity while a portion previously not active displays impressive evidence of late Pleistocene-Holocene displacements. Structural changes in the intermontane basins bounded by the Colfiorito fault system also indicate that the intensity of the tectonic activity decreased during the Quaternary. Not defining the structural evolution in the above mentioned cases would imply wrong conclusions for both the fault geometry and kinematics which may be delivered for seismotectonics and seismic hazard assessment. This typically leads to overestimate the fault length and the expected magnitude or to the increase in the number of seismogenic sources affecting an area. Finally, the definition of the structural evolution permits to select between different geometrical options in terms of active faulting framework (e.g. a system of parallel normal faults vs. a system of en-echelon normal oblique faults as in the case of the L’Aquila fault system) related to different geometries at depth (detachment normal fault vs. high-angle oblique fault). (literal)
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