Simultaneous monitoring of gas concentration and groundwater level at the Omaezaki 500-m well, central Japan: Spike-like concentration change of methane
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- TSUNOMORI FUMIAKI
- Laboratory for Earthquake Chemistry, Graduate School of Science, University of Tokyo
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- NOTSU KENJI
- Laboratory for Earthquake Chemistry, Graduate School of Science, University of Tokyo
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Simultaneous monitoring of the gas concentration and water level in groundwater was achieved at the Omaezaki open well. Coaxially arranged pipes inserted into the well enabled us to pump groundwater directly from an aquifer and to return it the aquifer without disturbing the groundwater level. Concentration of methane, as one subsurface-origin gas, was monitored using a quadrupole mass spectrometer equipped with a gas separation tube. The methane concentration intermittently showed spike-like increases during the observation period. The temporal change of the methane concentration was independent of the seismic activity around the station, the groundwater temperature, the ambient temperature, and the pumping rate, with the exception of the groundwater level. The methane concentration was associated with the difference of the groundwater level, of which the amplitude of a barometric response is greater than that of a tidal one. Spike-like increases of the methane concentration were explained using a logistic model as a function of the groundwater level change.
収録刊行物
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- GEOCHEMICAL JOURNAL
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GEOCHEMICAL JOURNAL 42 (1), 85-91, 2008
一般社団法人日本地球化学会
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詳細情報 詳細情報について
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- CRID
- 1390282679528319488
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- NII論文ID
- 130004469214
- 10021093041
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- NII書誌ID
- AA00654975
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- COI
- 1:CAS:528:DC%2BD1cXlslClur8%3D
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- ISSN
- 18805973
- 00167002
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- NDL書誌ID
- 9402608
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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- 使用不可