Concentration and carbon-isotopic change of dissolved gas from Murono mud volcano in Tokamachi City, Niigata Prefecture (central Japan), just before and after the 2014 Kamishiro Fault Earthquake

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  • Kakizaki Yoshihiro
    Gas Hydrate Research Laboratory, Organization for the Strategic Coordination of Research and Intellectual Properties, Meiji University
  • Snyder Glen
    Gas Hydrate Research Laboratory, Organization for the Strategic Coordination of Research and Intellectual Properties, Meiji University
  • Tanahashi Manabu
    Gas Hydrate Research Laboratory, Organization for the Strategic Coordination of Research and Intellectual Properties, Meiji University
  • Ishida Naoto
    Gas Hydrate Research Laboratory, Organization for the Strategic Coordination of Research and Intellectual Properties, Meiji University Present address: Department of Social Systems and Civil Engineering, Graduate School of Engineering, Tottori University
  • Matsumoto Ryo
    Gas Hydrate Research Laboratory, Organization for the Strategic Coordination of Research and Intellectual Properties, Meiji University

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  • 2014年の長野県神城断層地震の前後における新潟県十日町市室野泥火山の溶存ガス濃度と炭素同位体比の変化
  • 2014ネン ノ ナガノケンシンジョウ ダンソウ ジシン ノ ゼンゴ ニ オケル ニイガタケン トオカマチシシツノデイカザン ノ ヨウゾンガス ノウド ト タンソ ドウイタイヒ ノ ヘンカ

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<p>Dissolved gas concentrations, compositions, and carbon isotopic values are compared between times immediately prior to and following the 2014 Kamishiro Fault Earthquake at the Murono mud volcano (Tokamachi City, Niigata Prefecture, central Japan). Immediately following the earthquake, concentrations of methane, carbon dioxide, ethane, and propane increased, while carbon isotopic values of methane and ethane decreased, on average. Carbon isotopic values of methane and gas compositions (C1/[C2+C3] ratio) indicate that the dissolved methane of the mud volcano originates from the thermogenic decomposition of organic matter. As the carbon isotopic values of methane and ethane are significantly more positive than those of natural gas from the Niigata Oil and Gas Field, the dissolved gases of the mud volcano are thought to be derived from the deepest source rocks of the Niigata Oil and Gas Field. However, the supply of ethane generated from less mature source rocks possibly increased following the earthquake. Our results reveal that a change in behavior of fluid deep below the mud volcano was likely caused by fluctuations in volumetric strain related to the earthquake. Theoretical strain at the mud volcano can be estimated as 687×10-8, which is much higher than estimates from previous studies for the lower limits of strain triggered by anomalous activity at mud volcanoes. Murono mud volcano is an important case study for investigating the correlation between mud volcanoes and earthquakes, because it frequently experiences the large volumetric strain of earthquakes that are comparable to the 2014 Kamishiro Fault Earthquake.</p>

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