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Geological constraints for earthquake faulting studies in the Colfiorito area (central Italy)
Authors:Giuseppe Cello  Giovanni Deiana  Luca Ferelli  Leonardo Marchegiani  Laura Maschio  Stefano Mazzoli  Alessandro Michetti  Leonello Serva  Emanuele Tondi  Tiziano Vittori
Institution:(1) Dipartimento di Scienze della Terra, Università di Camerino, Italy;(2) ANPA (Associazione Nazionale Protezione Ambiente), Roma, Italy;(3) Facoltà di Scienze Ambientali, Università di Urbino, Italy
Abstract:On September 26, 1997, at 00.33 h(GMT), a Mw 5.7 earthquake occurred in the axial zone of theUmbria-Marche Apennines of central Italy, in the Colfiorito basin area. At09.40 h (GMT), a Mw 6.0 earthquake again struck the area withinthe Colfiorito basin, a major intramontane basin filled with Quaternarycontinental deposits. The two main shocks, and the associated aftershockswere within a roughly NNW-SSE trending zone of largest damage (Imax10), in which ground deformation has been observed. Along this trend,Cello et al. (1997a) had mapped a few capable faults, showingtranstensional to pure extensional kinematics. Field inspection of themapped faults, carried out after the main shocks, revealed that some ofthem were locally reactivated (for lengths of several hundreds metres andsurface slip in the range of 2–8 cm) during the September 26, 1997earthquakes.
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