Fluid geochemistry along the Eliki and Aigion seismogenic segments (Gulf of Corinth, Greece)

Abstract

Three geochemical surveys in ground waters were carried out in the Selianitika–Trapeza area, Gulf of Corinth, with the main purposes: (1) to define the geochemical patterns of the circulating ground waters; (2) to discriminate the role of active fault systems in affecting the ground water chemistry and hydrogeology, exploiting geochemical techniques tested in other areas; (3) to select sites for the continuous geochemical surveillance of the tectonic activity of the area. A total of 50 sites have been sampled, and numerous chemical and stable isotope analyses have been performed. We identify three geochemical active fault zones: (i) the Eliki–Nikolaikea area; (ii) the Selianitika–Rododafni–Nerazes area, and (iii) the Trapeza sector. The Nerazes well site and the Selianitika spa have been selected for exploiting a geochemical-hydrological monitoring surveillance of the tectonic activity.