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Detection of a healing process of the Nojima fault by a repeated water injection experiment and understanding of the mechanism of induced earthquakes

Research Project

Project/Area Number 11304025
Research Category

Grant-in-Aid for Scientific Research (A).

Allocation TypeSingle-year Grants
Section一般
Research Field 固体地球物理学
Research InstitutionUniversity of Tokyo

Principal Investigator

SHIMAZAKI Kunihiko  University of Tokyo, Earthquake Research Institute, Professor, 地震研究所, 教授 (50012951)

Co-Investigator(Kenkyū-buntansha) OSHIMAN Naoto  Kyoto University, Disaster Prevention Research Institute, Associate Professor, 防災研究所, 助教授 (70185255)
HIRATA Naoshi  University of Tokyo, Earthquake Research Institute, Professor, 地震研究所, 教授 (90156670)
NISHIGAMI Kin'ya  Kyoto University, Disaster Prevention Research Institute, Associate Professor, 防災研究所, 助教授 (00189276)
YAMAOKA Koshun  Nagoya University, Graduate School of Science, Associate Professor, 理学研究科, 助教授 (70183118)
YAMANO Makoto  university of Tokyo, Earthquake Research Institute, Associate Professor, 地震研究所, 助教授 (60191368)
安藤 雅孝  京都大学, 防災研究所, 教授 (80027292)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥18,100,000 (Direct Cost: ¥18,100,000)
Fiscal Year 2000: ¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 1999: ¥14,700,000 (Direct Cost: ¥14,700,000)
Keywordswater injection experiment / fault healing process / permeability / Nojima fault / Hyogoken-Nanbu earthquake / deep structure of active fault / induced earthquake / fracture-zone trapped wave
Research Abstract

A water injection experiment was carried out at the 1800m-deep borehole at the Nojima fault where the 1995 Kobe earthquake took place, in January to March 2000, three years after the first experiment conducted two years after the Kobe earthquake. The migration of the injected water was monitored by various geophysical measurements at the borehole and two other boreholes nearby, the seismic observation, and self-potential and resistivity measurements of the earth. The result of these observations and measurements suggests that the permeability in the ground surrounding the 1800m-deep borehole and also in a shallow (at depths of 0-4km) fracture zone of the Nojima fault has decreased, which is most likely to indicate a healing process after the Kobe earthquake. Although our new temperature measurement revealed that the injected water leaked at a depth of 540m, most of the injected water appears to migrate towards the fracture zone of the Nojima fault. Changes in water discharge at the bottom of a 800m-deep borehole, horizontally 50m away from the 1800m borehole, indicate that the permeability of surrounding rocks has decreased to about one-half that measured three years ago. The decrease of the permeability of surrounding rocks was also confirmed by self-potential observation. The activity of ultra-microearthquake in a distance of 2-4km from the borehole, increased four to seven days after the start of water injection, which is delayed two days in comparison with the previous experiment. If the activity was triggered by the injection of the water, the delay indicates a decrease in the permeability within the fracture zone of the fault. The migration of seismic sources and b-value decrease suggest that the seismic activity was induced by the water injection.

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (57 results)

All Other

All Publications (57 results)

  • [Publications] Murakami,H.,Hashimoto,T.,Oshima n,N.,Sumitomo,N.,Yamaguchi,S.,and Honkura,Y.: "Electrokinetic phenomena associated with the water injection experiment at Nojima earthquake fault in Awaji Island, Japan."Island Arc. 10(in press.). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Tadokoro,K. et al.: "Induced earthquakes accompanying the water injection experiment at the Nojima fault zone, Japan : Seismicity and its migration,"J.Geophys.Res.. 105,B3. 6089-6104 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yamaoka,K.,Kunitomo,T.,Miyakawa,K.,Kobayashi,K.and Kumazawa,M.: "A Trial for Monitoring Temporal Variation of Seismic Velocity with ACROSS System."Island Arc. 10(in press.). (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 島崎邦彦: "野島断層における繰り返し注水実験"月刊地球. 23,4. 229-231 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 西上欽也: "注水試験の概要、および野島断層浅部構造とその回復過程"月刊地球. 23,4. 232-235 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 山野誠,後藤秀作: "野島断層掘削孔における注水・湧水による孔内温度分布の変動"月刊地球. 23,4. 236-239 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 向井厚志,藤森邦夫,石井紘,中尾茂: "注水試験に伴うひずみ変化"月刊地球. 23,4. 240-244 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 北川有一,藤森邦夫,小泉尚嗣,野津憲治,五十嵐丈二: "繰り返し注水実験による淡路島800m孔の湧水量変化から推定された岩盤の透水性の時間変化"月刊地球. 23,4. 245-249 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 村上英記,橋本武志,大志万直人,山口覚: "注水実験時の電磁気観測(2)-流動電位計測-"月刊地球. 23,4. 250-255 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 山下太,柳谷俊,大志万直人: "GPS技術を利用したダイポールーダイポール法による野島断層近傍での大地比抵抗モニタリング,"月刊地球. 23,4. 256-259 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 永井悟,平田直,加納靖之,水野高志,山中寛志,田所敬一,西上欽也,平松良浩: "注水試験に伴う極微小地震活動の震源域の決定とその時間変化"月刊地球. 23,4. 260-263 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 田所敬一,加納靖之,西上欽也: "注水試験にともなうクラスタ的地震活動"月刊地球. 23,4. 264-267 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 平松良浩,古本宗充,西上欽也,大見士朗: "野島断層注水実験高サンプリングデータによる微小地震の初期破壊過程,"月刊地球. 23,4. 268-272 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 山中寛志,平松良浩,田所敬一,西上欽也: "野島断層注水実験の微小地震観測によるコーナー周波数(fc)のスケーリング則,"月刊地球. 23,4. 273-277 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 加納靖之,平松良浩,田所敬一,西上欽也: "注水実験前後の地震活動の規模別頻度分布,"月刊地球. 23,4. 277-280 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 水野高志,西上欽也: "注水実験における断層トラップ波の観測"月刊地球. 23,4. 281-285 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 山岡耕春,生田領野: "ACROSSによる注水実験にともなう地震波速度変動観測"月刊地球. 23,4. 285-289 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 伊藤久男,桑原保人: "地質調査所平林坑井における繰り返し観測"月刊地球. 23,4. 290-293 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 小泉誠,吉田義則,松尾成光: "注水実験・臨時地震観測の技術メモ"月刊地球. 23,4. 294-296 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Murakami, H., Hashimoto, T., Oshiman, N., Sumitomo, N., Yamaguchi, S., and Honkura, Y.: Electrokinetic phenomena associated with the water injection experiment at Nojima earthquake fault in Awaji Island, Japan. Island Arc.. (in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Tadokoro, K.et al.: "Induced earthquakes accompanying the water injection experiment at the Nojima fault zone, Japan : Seismicity and its migration"J.Geophys.Res.. 105, B3. 6089-6104 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yamaoka, K., Kunitomo, T., Miyakawa, K., Kobayashi, K.and Kumazawa, M.: "A Trial for Monitoring Temporal Variation of Seismic Velocity with ACROSS System."Island Arc. (in press). (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Shimazaki, K.: "Repeated water injection experiments at the Nojima fault"southwest Japan (in Japanese), Earth Monthly. 23. 229-231 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] K.Nishigami: "Repeated water-injection experiments at the Nojima fault to estimate the shallow fault-zone structure and its healing (in Japanese)"Earth Monthly. 23. 232-235 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yamano M., and S.Goto: "Temporal variation of the temperature profile in a borehole drilled into the Nojima fault due to water injection and outflow experiments (in Japanese)"Earth Monthly. 23. 236-239 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Mukai, A., K.Fujimori, H.Ishii, and S.Nakao: "Strain changes associated with the repeated water injection experiments at the Nojima fault (in Japanese)"Earth Monthly. 23. 240-244 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kitagawa, Y., K.Fujimori, N.Koizumi, K.Notsu, and G.Igarashi: "Temporal change in permeability of the rock near the Nojima fault estimated from discharge changes at the 800-m borehole in Awaji Island due to repeated water injection experiments (in Japanese)"Earth Monthly. 23. 245-249 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Murakami, H., T.Hashimoto, N.Oshiman, and S.Yamaguchi: "Geomagnetic and geoelectric observation during the water injection experiment at the Nojima fault (2)-measurements of streaming potential-(in Japanese)"Earth Monthly. 23. 250-255 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yamashita F., T.Yanagidani, and N.Oshiman: "Monitoring earth resistivity by dipole-dipole method using GPS technique at the Nojima fault site, Japan (in Japanese)"Earth Monthly. 23. 256-259 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Nagai, S., N.Hirat, Y.Kano, T.Mizuno, H.Yamanaka, K.Tadokoro, K.Nishigami, and Y.Hiramatsu: "Microseismicity before and after the water injection experiment at the Nojima fault (in Japanese)"Earth Monthly. 23. 260-263 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Tadokoro, K., Y.Kano, and K.Nishigami: "Earthquake clusters associated with the water injection experiment at the Nojima fault (in Japanese)"Earth Monthly. 23. 264-267 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Hiramatsu, Y., M.Furumoto, K.Nishigami, and S.Ohmi: "Initial rupture process of microearthquakes observed by high sampling borehole seismographs during the water injection experiment at the Nojima fault (in Japanese)"Earth Monthly. 23. 268-272 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yamanaka H., Y.Hiramatsu, K.Tadokoro and K.Nishigami: "Scaling law of corner frequency from the observation of microearthquakes during the water injection experiment at the Nojima fault (in Japanese)"Earth Monthly. 23. 273-277 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Kano, Y., Y.Hiramatsu, K.Tadokoro, K.Nishigami: "Frequency-magnitude distribution of earthquakes before and after the water injection experiment at the Nojima fault (in Japanese)"Earth Monthly. 23. 277-280 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Mizuno T., and K.Nishigami: "A fault-zone trapped-wave observation during the water injection experiment at the Nojima fault (in Japanese)"Earth Monthly. 23. 281-285 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Yamaoka K., and R.Ikuta: "Monitoring temporal variation of seismic velocity during the water injection experiment at the Nojima fault using ACROSS system (in Japanese)"Earth Monthly. 23. 285-289 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Ito, H., and Y.Kuwabara: "Various repeated geophysical measurements at a GSJ deep borehole at Hirabayashi, (in Japanese)"Earth Monthly. 23. 290-293 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Koizumi M., Y.Yoshida, and S.Matsuo: "Technical report on the temporary seismic observation system for the water injection experiment at the Nojima fault (in Japanese)"Earth Monthly. 23. 285-289 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Murakami,H.,Hashimoto,T.,Oshiman,N.,Sumitomo,N.,Yamaguchi,S.,and Honkura,Y.: "Electrokinetic phenomena associated with the water injection experiment at Nojima earthquake fault in Awaji Island, Japan."Island Arc. 10(in press.). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Tadokoro,K. et al.: "Induced earthquakes accompanying the water injection experiment at the Nojima fault zone, Japan : Seismicity and its migration,"J.Geophys.Res.. 105,B3. 6089-6104 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Yamaoka,K.,Kunitomo,T.,Miyakawa,K.,Kobayashi,K.and Kumazawa,M.: "A Trial for Monitoring Temporal Variation of Seismic Velocity with ACRO SS System."Island Arc. 10(in press.). (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 島崎邦彦: "野島断層における繰り返し注水実験"月刊地球. 23,4. 229-231 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 西上欽也: "注水試験の概要、および野島断層浅部構造とその回復過程"月刊地球. 23,4. 232-235 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 山野誠,後藤秀作: "野島断層掘削孔における注水・湧水による孔内温度分布の変動"月刊地球. 23,4. 236-239 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 向井厚志,藤森邦夫,石井紘,中尾茂: "注水試験に伴うひずみ変化"月刊地球. 23,4. 240-244 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 北川有一,藤森邦夫,小泉尚嗣,野津憲治,五十嵐丈二: "繰り返し注水実験による淡路島800m孔の湧水量変化から推定された岩盤の透水性の時間変化"月刊地球. 23,4. 245-249 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 村上英記,橋本武志,大志万直人,山口覚: "注水実験時の電磁気観測(2)-流動電位計測-"月刊地球. 23,4. 250-255 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 山下太,柳谷俊,大志万直人: "GPS技術を利用したダイポールーダイポール法による野島断層近傍での大地比抵抗モニタリング,"月刊地球. 23,4. 256-259 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 永井悟,平田直,加納靖之,水野高志,山中寛志,田所敬一,西上欽也,平松良浩: "注水試験に伴う極微小地震活動の震源域の決定とその時間変化"月刊地球. 23,4. 260-263 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 田所敬一,加納靖之,西上欽也: "注水試験にともなうクラスタ的地震活動"月刊地球. 23,4. 264-267 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 平松良浩,古本宗充,西上欽也,大見士朗: "野島断層注水実験高サンプリングデータによる微小地震の初期破壊過程,"月刊地球. 23,4. 268-272 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 山中寛志,平松良浩,田所敬一,西上欽也: "野島断層注水実験の微小地震観測によるコーナー周波数(fc)のスケーリング則,"月刊地球. 23,4. 273-277 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 加納靖之,平松良浩,田所敬一,西上欽也: "注水実験前後の地震活動の規模別頻度分布,"月刊地球. 23,4. 277-280 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 水野高志,西上欽也: "注水実験における断層トラップ波の観測"月刊地球. 23,4. 281-285 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 山岡耕春,生田領野: "ACROSSによる注水実験にともなう地震波速度変動観測"月刊地球. 23,4. 285-289 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 伊藤久男,桑原保人: "地質調査所平林坑井における繰り返し観測"月刊地球. 23,4. 290-293 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] 小泉誠,吉田義則,松尾成光: "注水実験・臨時地震観測の技術メモ"月刊地球. 23,4. 294-296 (2001)

    • Related Report
      2000 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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