Abstract
A geochemical survey offumarolic and submerged gases from fluid discharges located in the Nea Kameni and Palea Kameni islets (Santorini Island, Greece) was carried out before, during, and after the unrest related to the anomalously highseismicandgrounddeformationactivitythataffectedthis volcanic system since January 2011. Our data show that from May 2011 to February 2012, the Nea Kameni fumaroles showed a significant increase of H2 concentrations. After this period, anabruptdecrease inthe H2contents, accompanied by decreasing seismic events, was recorded. A similar temporal pattern was shown by the F − ,C l − ,S O4 2− ,a nd NH4 + concen- trations in the fumarolic condensates. During the sharp
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