By Piccardi, Luigi Monti, Cassandra; Vaselli, Orlando; Tassi, Franco; Gaki-Papanastassiou, Kalliopi; Papanastassiou, Dimitris Abstract: Extensive geochemical investigation (of water, travertine, soil and diffuse gas), coupled with geostructural analysis, provides new insights into local fault-fluid interaction and allows us to pinpoint basic elements in the geological origin (or geomythology) of the Delphic Oracle, still debated by geologists.