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

Author

Listed:
  • Selin Süer

    (Middle East Technical University
    Middle East Technical University)

  • Thomas Wiersberg

    (Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences)

  • Nilgün Güleç

    (Middle East Technical University)

  • Jörg Erzinger

    (Helmholtz Centre Potsdam, GFZ German Research Centre for Geosciences)

  • Mahmut Parlaktuna

    (Middle East Technical University)

Abstract

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

Suggested Citation

  • Selin Süer & Thomas Wiersberg & Nilgün Güleç & Jörg Erzinger & Mahmut Parlaktuna, 2020. "Real-time gas monitoring at the Tekke Hamam geothermal field (Western Anatolia, Turkey): an assessment in relation to local seismicity," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 104(2), pages 1655-1678, November.
    • Handle: RePEc:spr:nathaz:v:104:y:2020:i:2:d:10.1007_s11069-020-04238-8
    DOI: 10.1007/s11069-020-04238-8
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    References listed on IDEAS

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    1. Huiling Zhou & Hejun Su & Hui Zhang & Chenhua Li, 2017. "Correlations between soil gas and seismic activity in the Generalized Haiyuan Fault Zone, north-central China," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 85(2), pages 763-776, January.
    2. Dipak Ghosh & Argha Deb & Swarup Sahoo & Subrata Haldar & Rosalima Sengupta, 2011. "Radon as seismic precursor: new data with well water of Jalpaiguri, India," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 58(3), pages 877-889, September.
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