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  1. B100 理学部/理学研究科
  2. B100b 紀要
  3. The Journal of earth and planetary sciences
  4. 45

Seismo-geochemical observation at a deep bore-hole well of Nagashima spa in the Yoro-Ise Bay fault zone, central Japan

https://doi.org/10.18999/joueps.45.1
https://doi.org/10.18999/joueps.45.1
a25ae835-365f-41ff-8bcc-2b62f93438f6
名前 / ファイル ライセンス アクション
KJ00000037591.pdf KJ00000037591.pdf (989.0 kB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2006-01-05
タイトル
タイトル Seismo-geochemical observation at a deep bore-hole well of Nagashima spa in the Yoro-Ise Bay fault zone, central Japan
言語 en
著者 Ito, Takamori

× Ito, Takamori

WEKO 3327

en Ito, Takamori

Search repository
Kawasaki, Keisuke

× Kawasaki, Keisuke

WEKO 3328

en Kawasaki, Keisuke

Search repository
Nagamine, Koichiro

× Nagamine, Koichiro

WEKO 3329

en Nagamine, Koichiro

Search repository
Yamamoto, Koshi

× Yamamoto, Koshi

WEKO 3330

en Yamamoto, Koshi

Search repository
Adachi, Mamoru

× Adachi, Mamoru

WEKO 3331

en Adachi, Mamoru

Search repository
Kawabe, Iwao

× Kawabe, Iwao

WEKO 3332

en Kawabe, Iwao

Search repository
アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
抄録
内容記述 A new station for seismo-geochemical observation has been installed at a 1,500 m bore-hole well of Nagashima spa in a southwestern suburb of Nagoya, central Japan. The well is located in the Yoro-Ise Bay active fault zone. Gas bubbles are separating from groundwater being pumped constantly at the well. In November 1997,we started automated monitoring of H_2,He, Ar, N_2,CH_4 and Rn in the gas bubbles by using a gas chromatograph and an α scintillation Rn monitor. Even in a short monitoring period less than one year, similar preseismic increases in the H_2 concentration have been recorded for nearby microearthquakes (M=1.6,1.9,2.0 and 2.6) and small and moderately large events (M=3.8 and 5.4) within the focal distance of 25 km. All the six events occurred in parallel with the Yoro fault several kilometers apart in the west. In particular, three microearthquakes before the M=5.4 event and the moderately large event itself accompanied conspicuous H_2 anomalies. Preseimic increases in the H_2 concentration up to 100% during a few to several weeks were followed by spike-like increases of H_2 concentration of 10-100% immediately after the respective four shocks. No comparable anomalies were seen in the gas species other than H_2. The preseismic increases in groundwater H_2 are plausibly geochemical diagnostics of the stress corrosion process preceding earthquakes. The preseismic H_2 anomalies for the two events (M=3.8 and 1.9) after the M=5.4 shock were less conspicuous than those for the other four events. The background-level of H_2 concentration also decreased significantly after the M=5.4 event. The subsurface H_2 behavior may have reflected the stress condition in the Yoro fault zone altered by the M=5.4 earthquake.
言語 en
内容記述タイプ Abstract
内容記述
内容記述 国立情報学研究所で電子化したコンテンツを使用している。
言語 ja
内容記述タイプ Other
出版者
言語 en
出版者 Dept. of Earth and Planetary Sciences, Nagoya University
言語
言語 eng
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ departmental bulletin paper
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
ID登録
ID登録 10.18999/joueps.45.1
ID登録タイプ JaLC
ISSN(print)
収録物識別子タイプ PISSN
収録物識別子 0919875X
書誌情報 en : The Journal of earth and planetary sciences, Nagoya University

巻 45, p. 1-15, 発行日 1998-12
フォーマット
application/pdf
著者版フラグ
値 publisher
URI
識別子 http://hdl.handle.net/2237/2839
識別子タイプ HDL
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