Real-time gas monitoring at the Tekke Hamam geothermal field (Western Anatolia, Turkey): an assessment in relation to local seismicity

摘要: This study presents the results of a real-time gas monitoring experiment conducted, via use quadrupole mass spectrometer, in mofette field within Tekke Hamam geothermal site western Anatolia (Turkey), tectonically active region hosting several east–west trending grabens. The is aimed to establish baseline profile region. Within framework experiment, compositions (CO2, N2, O2, H2, H2S, CH4, He, and Ar) flow rate were monitored during two observation periods: November 2007–January 2008 April–July 2008. During course monitoring, major component was CO2 with concentration changing around 96 volume percent. Other gases, from most abundant least, Ar, He. produced short-term, daily/diurnal variations temporal fluctuations appearing as instant signals. Although did not reach anomaly level (variations staying mean ± 2σ), some more than one parameter (exceeding mean ± 1σ), accompanied by changes diurnal pulses lasting for long durations, correlated seismic events selected according adopted event elimination criteria. mainly attributed mixing ratios relation porosity/permeability modifications possibly related seismicity. Studies involving continuous meteorological parameters are necessary assign these geogenic events.