GNGTS 2022 - Atti del 40° Convegno Nazionale

104 GNGTS 2022 Sessione 1.2 is about 40 m. The temperature monitoring started at the same time as the gas monitoring. The acquisition interval of the temperature sensor was set at 15 minutes and the data were stored into the data-logger to be then downloaded every month by connecting the sensor to a laptop computer. Results and discussion. The results showed methane as predominant gas and temporal changes in gas concentrations that were in part due to daily fluctuations, which caused small amplitude variations, and in part due to non-environmental causes. These latter were correlated with the occurrence of strong earthquakes and slow tectonic events related to magmatic intrusions, but not with input of magmatic gases into the thermal aquifer, given the non-magmatic origin of all monitored gases. Methane spikes were observed during many volcano-tectonic events and call for a deep source of this gas. H 2 S was detected only during the Fig. 1. Fig. 2.