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During the 2004-2005 winter months, three new anomaly areas in temperature and electric conductivity of groundwaters appeared along the Yukyu-zan active fault and its inferred northeastern and southwestern extensions, in the eastern part of Kawaguchi Town and Horinouchi region of Uonuma City, and along the northern extension of the Muikamachi active fault from Koide to Obiro regions. The former one area is located on the hanging wall block of the seismogenic source fault of the earthquake. The latter two areas are situated on the footwall of the source fault. The groundwaters from these three anomaly areas are characterized by high NaCl concentration and high water-temperature. The high-salinity and high temperature groundwaters are considered to be mixtures of deep hot fossil seawater and meteoric waters on the basis of hydrochemical characteristics. Therefore, the seismic fracturing may have increased permeability and assisted upward flows of deep hot groundwaters immediately after the earthquake. During the 2005-2006 winter months, temperature and electric conductivity of groundwaters from the anomaly area on the hanging wall have remarkably increased. During the same months, considerable decreases in temperature, electric conductivity, and NaCl concentration of grooundwaters have been recognized in the anomaly areas on the footwall. 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  1. 0 資料タイプ別
  2. 03 紀要論文
  1. 360 災害・復興科学研究所
  2. 20 紀要
  3. 91 新潟大学災害復興科学センター年報
  4. 第1号

2004年新潟県中越地震と地下水異常・活構造

http://hdl.handle.net/10191/5972
http://hdl.handle.net/10191/5972
a18932c1-1c57-4a40-8cba-a53316657bdb
名前 / ファイル ライセンス アクション
2_0038.pdf 2_0038.pdf (26.5 MB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2008-04-08
タイトル
タイトル 2004年新潟県中越地震と地下水異常・活構造
タイトル
言語 en
タイトル 2004年新潟県中越地震と地下水異常・活構造
言語
言語 jpn
キーワード
主題Scheme Other
主題 2004年新潟県中越地震
キーワード
主題Scheme Other
主題 消雪井戸
キーワード
主題Scheme Other
主題 地下水温
キーワード
主題Scheme Other
主題 水質
キーワード
主題Scheme Other
主題 活断層
キーワード
主題Scheme Other
主題 地下水異常
キーワード
主題Scheme Other
主題 the Mid Niigata prefecture Earthquake in 2004
キーワード
主題Scheme Other
主題 snow-melting well
キーワード
主題Scheme Other
主題 groundwater temperature
キーワード
主題Scheme Other
主題 hydrochemistry
キーワード
主題Scheme Other
主題 active fault
キーワード
主題Scheme Other
主題 groundwater anomalies
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ departmental bulletin paper
その他のタイトル
その他のタイトル Groundwater anomalies and active faults related to the Mid Niigata Prefecture Earthquake in 2004
著者 村山, 友之

× 村山, 友之

WEKO 160503

村山, 友之

Search repository
佐藤, 早苗

× 佐藤, 早苗

WEKO 160504

佐藤, 早苗

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氏原, 英敏

× 氏原, 英敏

WEKO 160505

氏原, 英敏

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森, 友紀

× 森, 友紀

WEKO 160506

森, 友紀

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豊島, 剛志

× 豊島, 剛志

WEKO 160507

豊島, 剛志

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渡部, 直喜

× 渡部, 直喜

WEKO 160508

渡部, 直喜

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和田, 幸永

× 和田, 幸永

WEKO 160509

和田, 幸永

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小安, 孝幸

× 小安, 孝幸

WEKO 160510

小安, 孝幸

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播磨, 雄太

× 播磨, 雄太

WEKO 160511

播磨, 雄太

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小林, 健太

× 小林, 健太

WEKO 160512

小林, 健太

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大川, 直樹

× 大川, 直樹

WEKO 160513

大川, 直樹

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小泉, 尚嗣

× 小泉, 尚嗣

WEKO 160514

小泉, 尚嗣

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著者別名
識別子 160515
識別子Scheme WEKO
姓名 Murayama, Tomoyuki
著者別名
識別子 160516
識別子Scheme WEKO
姓名 Satoh, Sanae
著者別名
識別子 160517
識別子Scheme WEKO
姓名 Ujihara, Hidetoshi
著者別名
識別子 160518
識別子Scheme WEKO
姓名 Mori, Yuki
著者別名
識別子 160519
識別子Scheme WEKO
姓名 Toyoshima, Tsuyoshi
著者別名
識別子 160520
識別子Scheme WEKO
姓名 Watanabe, Naoki
著者別名
識別子 160521
識別子Scheme WEKO
姓名 Wada, Yukinaga
著者別名
識別子 160522
識別子Scheme WEKO
姓名 Koyasu, Takayuki
著者別名
識別子 160523
識別子Scheme WEKO
姓名 Harima, Yuta
著者別名
識別子 160524
識別子Scheme WEKO
姓名 Kobayashi, Kenta
著者別名
識別子 160525
識別子Scheme WEKO
姓名 Ohkawa, Naoki
著者別名
識別子 160526
識別子Scheme WEKO
姓名 Koizumi, Naoji
抄録
内容記述タイプ Abstract
内容記述 We examined considerable changes in temperature, electric conductivity and hydrochemistry of groundwaters around the epicentral area of the Mid Niigata prefecture Earthquake in 2004 during one year from 2004-2005 to 2005-2006 winter months using snow-melting wells, and identified hydrogeological processes and origin of groundwaters. During the 2004-2005 winter months, three new anomaly areas in temperature and electric conductivity of groundwaters appeared along the Yukyu-zan active fault and its inferred northeastern and southwestern extensions, in the eastern part of Kawaguchi Town and Horinouchi region of Uonuma City, and along the northern extension of the Muikamachi active fault from Koide to Obiro regions. The former one area is located on the hanging wall block of the seismogenic source fault of the earthquake. The latter two areas are situated on the footwall of the source fault. The groundwaters from these three anomaly areas are characterized by high NaCl concentration and high water-temperature. The high-salinity and high temperature groundwaters are considered to be mixtures of deep hot fossil seawater and meteoric waters on the basis of hydrochemical characteristics. Therefore, the seismic fracturing may have increased permeability and assisted upward flows of deep hot groundwaters immediately after the earthquake. During the 2005-2006 winter months, temperature and electric conductivity of groundwaters from the anomaly area on the hanging wall have remarkably increased. During the same months, considerable decreases in temperature, electric conductivity, and NaCl concentration of grooundwaters have been recognized in the anomaly areas on the footwall. The difference between the first and second winter months after the earthquake suggests that the permeability in the hanging wall did not decrease under an E-W extensional condition and remains enhancing deep circulation of groundwater along the Yukyu-zan active fault, whereas the permeability in the footwall under an E-W compressional condition decreased and consequently the temperature, electric conductivity and NaCl concentration of groundwaters were lowered.
書誌情報 新潟大学災害復興科学センター年報
en : 新潟大学災害復興科学センター年報

巻 1, p. 155-174, 発行日 2007-07
出版者
出版者 新潟大学災害復興科学センター
ISSN
収録物識別子タイプ ISSN
収録物識別子 18822177
書誌レコードID
収録物識別子タイプ NCID
収録物識別子 AA12224463
著者版フラグ
値 publisher
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