GNGTS 2015 - Atti del 34° Convegno Nazionale

Five Fault Classes have been proposed in this model: for each class, the maximum expected offsets and typical widths of the hazard zone in the footwall and in the hanging-wall of the master capable fault are provided. To this end, the capable faults recorded in ITHACA have been split into three main groups according to the prevalent fault kinematics (normal, reverse or strike-slip) and classified into different classes identified by specific maximum magnitude ranges (Fig. 2). In order to take into account the uncertainties affecting the location of capable faults recorded in ITHACA, a standard minimum width value equal to 30 m has been introduced on both the side of the fault trace (of course, in some cases it could be convenient to consider a larger uncertainty, if the resolution of original data sources is very scarce). For normal faults (Fig. 2, above) these relationships result from a careful review of the documented normal surface faulting pattern caused by several modern and historical events occurred in the Italian territory (cfr. Boncio et al. , 2012 and bibliography therein). Since in an Fig. 1 – The ITHACA database over the ZS9 seismotectonic zonation (Meletti and Valensise, 2004). According to the Fault Class parameter (Guerrieri et al. , 2014), it is possible to evaluate maximum expected offsets: 1: 0-5 cm; 2: 5-20 cm; 3: 20-50 cm; 4: 50-150 cm; 5: up to 250 cm. GNGTS 2015 S essione 2.2 191