“…Accordingly, soil-gas surveys was recognized as a valid tool to trace faults and areas of brittle deformation especially when they have no clear expression at surface and/or when they are masked by unconsolidated lithologies (e.g. Ciotoli et al, 1998Ciotoli et al, , 1999Ciotoli et al, , 2003Burton et al, 2004;Voltattorni and Lombardi, 2010;Neri et al, 2011). Identification of potentially active hidden faults is of significant relevance for both neotectonic studies and seismic hazard management (e.g.…”