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Precise volcano monitoring by actively controlled electromagnetic signal using frequency comb

Research Project

Project/Area Number 20H01992
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 17040:Solid earth sciences-related
Research InstitutionTokyo Institute of Technology

Principal Investigator

Ogawa Yasuo  東京工業大学, 理学院, 教授 (10334525)

Co-Investigator(Kenkyū-buntansha) 市原 寛  名古屋大学, 環境学研究科, 講師 (90553074)
南 拓人  神戸大学, 理学研究科, 助教 (90756496)
石須 慶一  東京工業大学, 理学院, 研究員 (80880054)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2022: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2021: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2020: ¥13,390,000 (Direct Cost: ¥10,300,000、Indirect Cost: ¥3,090,000)
Keywords火山モニタリング / 人工電磁探査 / 周波数コム信号
Outline of Research at the Start

火山の噴火予知研究では、地下のマグマや熱水系の分布を解明し、その時間的な変動を監視する観測が重要である。比抵抗はマグマや熱水や粘土鉱物の分布に敏感な物理量であり、地表での電磁波の観測から、地下の比抵抗分布やその時間変動を検知することができる。地下の比抵抗分布の時間的な変動を精密に監視するには、精密に制御された人工信号を利用する電磁場観測が必須である。本研究では、精密に制御された2系統の信号系列送信し、多数の受信機で常時取得することによって、革新的な精度で火山の3次元地下構造を常時モニターするシステムを開発する。草津白根火山でこの実証実験を行う。

Outline of Final Research Achievements

An electromagnetic monitoring system using precisely controlled frequency comb signals was constructed and was demonstrated at Kusatsu-Shirane volcano. Two transmitter dipoles were installed at the southern foot of the volcano, and electromagnetic receivers were placed around the peak. The distances between the transmitters and receivers are approximately 5 km. The current dipoles were in two directions one in the east-west direction and the other in the north-south direction, transmitting sine waves consisting of frequency sets with logarithmic equal intervals in the frequency range of 0.02 Hz to 4.6 Hz. By synchronising the function generator with a 10 MHz GPS signal, the transmitted signal could be repeated with high accuracy over a long period of time. The stacking method using the inverse of the noise as weights was found to be effective in extracting weak repetitive signal components from the received signals, and the response functions could be easily obtained.

Academic Significance and Societal Importance of the Research Achievements

火山噴火予測研究、特に水蒸気噴火の予測のために、流体や蒸気の分布に敏感な比抵抗構造をモニタリングすることは重要である。既存の自然信号を用いる方法では、不安定な信号強度や人工ノイズの混入によって常時モニター観測が困難であった。本研究では、精密に制御された信号を繰り返し送信することによって、小さなパワーの送信源でありながら、革新的な精度で電磁気観測が可能になることを示している。同時に複数の送信源から送信することも可能であり、受信信号からテンソル情報を引き出すことができることもメリットである。この観測手法は、火山活動モニタリングの新たな方法として、今後防災研究にも大きく貢献できる可能性がある。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (37 results)

All 2022 2021 2020 Other

All Int'l Joint Research (1 results) Journal Article (10 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 10 results,  Open Access: 5 results) Presentation (25 results) (of which Int'l Joint Research: 11 results,  Invited: 2 results) Remarks (1 results)

  • [Int'l Joint Research] GNS Science(ニュージーランド)

    • Related Report
      2021 Annual Research Report
  • [Journal Article] 3-D resistivity imaging of the supercritical geothermal system in the Sengan geothermal region, NE Japan2022

    • Author(s)
      Yamaya, Y., Suzuki, Y., Murata, Y., Okamoto, K., Watanabe, N., Asanuma, H., Hase, H., Ogawa, Y., Mogi, T., Ishizu, K., Uchida, T.
    • Journal Title

      Geothermics

      Volume: 103 Pages: 102412-102412

    • DOI

      10.1016/j.geothermics.2022.102412

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Trans-crustal structural control of CO2-rich extensional magmatic systems revealed at Mount Erebus Antarctica2022

    • Author(s)
      Hill GJ, Wannamaker PE, Maris V, Stodt JA, Kordy MA, Unsworth MJ, Bedrosian P, Wallin E, Uhlmann DF, Ogawa Y, Kyle PR
    • Journal Title

      Nat Commun

      Volume: 13 Issue: 1 Pages: 1-10

    • DOI

      10.1038/s41467-022-30627-7

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Estimation of an ultra-high-temperature geothermal reservoir model in the Kakkonda geothermal field, northeastern Japan2022

    • Author(s)
      Suzuki Yota、Akatsuka Takashi、Yamaya Yusuke、Watanabe Norihiro、Okamoto Kyosuke、Osato Kazumi、Kajiwara Tatsuya、Ogawa Yasuo、Mogi Toru、Tsuchiya Noriyoshi、Asanuma Hiroshi
    • Journal Title

      Geothermics

      Volume: 105 Pages: 102525-102525

    • DOI

      10.1016/j.geothermics.2022.102525

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Estimation of Spatial Distribution and Fluid Fraction of a Potential Supercritical Geothermal Reservoir by Magnetotelluric Data: A Case Study From Yuzawa Geothermal Field, NE Japan2022

    • Author(s)
      Ishizu Keiichi、Ogawa Yasuo、Nunohara Keishi、Tsuchiya Noriyoshi、Ichiki Masahiro、Hase Hideaki、Kanda Wataru、Sakanaka Shinya、Honkura Yoshimori、Hino Yuta、Seki Kaori、Tseng Kuo Hsuan、Yamaya Yusuke、Mogi Toru
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 127 Issue: 2

    • DOI

      10.1029/2021jb022911

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Ability of the magnetotelluric method to image a deep conductor: Exploration of a supercritical geothermal system2021

    • Author(s)
      Ishizu Keiichi、Ogawa Yasuo、Mogi Toru、Yamaya Yusuke、Uchida Toshihiro
    • Journal Title

      Geothermics

      Volume: 96 Pages: 102205-102205

    • DOI

      10.1016/j.geothermics.2021.102205

    • NAID

      40022604904

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] The 2018 phreatic eruption at Mt. Motoshirane of Kusatsu-Shirane volcano, Japan: eruption and intrusion of hydrothermal fluid observed by a borehole tiltmeter network2021

    • Author(s)
      Terada Akihiko、Kanda Wataru、Ogawa Yasuo、Yamada Taishi、Yamamoto Mare、Ohkura Takahiro、Aoyama Hiroshi、Tsutsui Tomoki、Onizawa Shin’ya
    • Journal Title

      Earth, Planets and Space

      Volume: 73 Issue: 1 Pages: 157-157

    • DOI

      10.1186/s40623-021-01475-4

    • NAID

      120007166069

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Offshore-onshore resistivity imaging of freshwater using a controlled-source electromagnetic method: A feasibility study2021

    • Author(s)
      Ishizu Keiichi、Ogawa Yasuo
    • Journal Title

      GEOPHYSICS

      Volume: 86 Issue: 6 Pages: E391-E405

    • DOI

      10.1190/geo2020-0906.1

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Simultaneous Analysis of Seismic Velocity and Electrical Conductivity in the Crust and the Uppermost Mantle: A Forward Model and Inversion Test Based on Grid Search2021

    • Author(s)
      Iwamori Hikaru、Ueki Kenta、Hoshide Takashi、Sakuma Hiroshi、Ichiki Masahiro、Watanabe Tohru、Nakamura Michihiko、Nakamura Hitomi、Nishizawa Tatsuji、Nakao Atsushi、Ogawa Yasuo、Kuwatani Tatsu、Nagata Kenji、Okada Tomomi、Takahashi Eiichi
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 126 Issue: 9

    • DOI

      10.1029/2021jb022307

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Anatomy of active volcanic edifice at the Kusatsu?Shirane volcano, Japan, by magnetotellurics: hydrothermal implications for volcanic unrests2020

    • Author(s)
      Tseng Kuo Hsuan、Ogawa Yasuo、Nurhasan、Tank Sabri Bulent、Ujihara Naoto、Honkura Yoshimori、Terada Akihiko、Usui Yoshiya、Kanda Wataru
    • Journal Title

      Earth, Planets and Space

      Volume: 72 Issue: 1

    • DOI

      10.1186/s40623-020-01283-2

    • NAID

      120006936897

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Temporal Magnetotellurics Reveals Mechanics of the 2012 Mount Tongariro, NZ, Eruption2020

    • Author(s)
      Hill Graham J.、Bibby Hugh M.、Peacock Jared、Wallin Erin L.、Ogawa Yasuo、Caricchi Luca、Keys Harry、Bennie Stewart L.、Avram Yann
    • Journal Title

      Geophysical Research Letters

      Volume: 47 Issue: 8

    • DOI

      10.1029/2019gl086429

    • NAID

      120006871864

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] EM-ACROSS法によるInferno crater lakeの比抵抗構造解析に向けて2022

    • Author(s)
      北岡紀広・小川康雄・石須慶一・南拓人・TG Caldwell・A. Kirkby
    • Organizer
      2022年度 Conductivity Anomaly 研究会
    • Related Report
      2022 Annual Research Report
  • [Presentation] EM-ACROSS System: Installation at the Kusatsu-Shirane Volcano, Japan2022

    • Author(s)
      Serita, S., Ogawa, Y., Ishizu, K., Tseng, K.H., Kunitomo, T., Minami, T., Ichihara, H, Caldwell, T.G., Heise, W., Bertrand E.A.
    • Organizer
      EMIW 2022, Cesme, Turkey
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Magnetotelluric exploration of deep geothermal resources in Japan2022

    • Author(s)
      Ogawa, Y.
    • Organizer
      GNS Seminar, Wairakei, New Zealand
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 電磁アクロスデータの時系列解析(2)2022

    • Author(s)
      芹田 創平・小川 康雄・曾 國軒・石須 慶一・國友 孝洋・南 拓人・市原 寛・Caldwell T.G.
    • Organizer
      JPGU 2022, 2022.5.22
    • Related Report
      2022 Annual Research Report
  • [Presentation] 草津白根山のMT連続観測データ2022

    • Author(s)
      若江秀樹・小川康雄
    • Organizer
      2021年度 Conductivity Anomaly 研究会
    • Related Report
      2021 Annual Research Report
  • [Presentation] EM-ACROSSデータの現状と今後の展望2022

    • Author(s)
      小川康雄・石須慶一・芹田創平・南拓人・市原寛・國友孝洋・TG Caldwell
    • Organizer
      2021年度 Conductivity Anomaly 研究会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Crustal fault valve control of the CO2 rich Erebus volcano phonolite magmatic system, Antarctica2021

    • Author(s)
      Graham Hill, Philip E Wannamaker, Virginia Maris, John A Stodt, Michal A Kordy, Martyn Jonathan Unsworth, Paul Bedrosian, Erin Wallin, Danny F Uhlmann, Yasuo Ogawa, Philip R Kyle
    • Organizer
      AGU Fall Meeting 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Estimation of spatial distribution and fluid fraction of a potential supercritical geothermal reservoir by magnetotelluric data: a case study from Yuzawa geothermal field, NE Japan2021

    • Author(s)
      Keiichi Ishizu, Yasuo Ogawa, Keishi Nunohara, Noriyoshi Tsuchiya, Masahiro Ichiki, Hideaki Hase, Wataru Kanda, Shinya Sakanaka, Yoshimori Honkura, Yuta Hino, Kaori Seki, Kuo Hsuan Tseng, Yusuke Yamaya and Toru Mogi
    • Organizer
      AGU Fall Meeting 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A feasibility study of offshore-onshore resistivity imaging of freshwater using a controlled source electromagnetic method2021

    • Author(s)
      Keiichi Ishizu, Yasuo Ogawa
    • Organizer
      AGU Fall Meeting 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] MTデータによる超臨界地熱貯留層の空間分布と流体割合の推定:東北湯沢地熱域での例2021

    • Author(s)
      石須慶一,小川康雄,布原 啓史,土屋 範芳,市來 雅啓,長谷 英彰,神田 径 ,坂中伸也,本藏義守,日野裕太,関香織,Kuo Hsuan Tseng,山谷祐介, 茂木透
    • Organizer
      物理探査学会第145回(2021年度秋季)学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Three-dimensional electrical resistivity structure beneath the back-arc side of the southern Tohoku region2021

    • Author(s)
      Y Usui, M Uyeshima, H Hase, H Ichihara, K Aizawa, T Koyama, S Sakanaka, T Ogawa, Y Yamaya, T Nishitani, Y Ogawa, R Yoshimura, S Takakura, M Mishina, Y Morita
    • Organizer
      第150回 地球電磁気・地球惑星圏学会 総会および講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] MTデータを用いた超臨界地熱貯留層の空間分布と流体割合の推定: 湯沢地熱域のおける ケーススタディ2021

    • Author(s)
      石須慶一,小川康雄,布原 啓史,土屋 範芳,市來 雅啓,長谷 英彰,神田 径 ,坂中伸也,本藏義守,日野裕太,関香織,Kuo Hsuan Tseng,山谷祐介, 茂木透
    • Organizer
      日本地熱学会令和3年度学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Coastal resistivity imaging of freshwater using a controlled source electromagnetic method2021

    • Author(s)
      Ishizu, K., Ogawa, Y.
    • Organizer
      The 14th SEGJ International Symposium
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 傾斜計過渡応答を用いた草津白根火山2018年噴火の地盤変動解析2021

    • Author(s)
      山田大志・寺田暁彦・神田径・上田英樹・青山裕・大倉敬宏・小川康雄・棚田俊收
    • Organizer
      日本火山学会 2021 年度秋季大会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Offshore-onshore resistivity imaging of freshwater using a controlled source electromagnetic method2021

    • Author(s)
      Ishizu, K., Ogawa, Y.
    • Organizer
      IAGA-IASPEI 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Imaging fluids in the crust: seismological and volcanological applications2021

    • Author(s)
      Yasuo Ogawa
    • Organizer
      EMinars, online, https://www.mtnet.info/EMinars/EMinars.html, https://www.youtube.com/watch?v=Egf6aOH_qWg
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] MT法を用いた深部低比抵抗体のイメージング能力について:超臨界地熱資源探査の例2021

    • Author(s)
      石須慶一・小川康雄・茂木透・山谷祐介・内田利弘
    • Organizer
      物理探査学会第144回(2021年度春季)学術講演会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Offshore-onshore seamless resistivity imaging of freshwater using a controlled source electromagnetic method2021

    • Author(s)
      Ishizu, K., Ogawa, Y.
    • Organizer
      JPGU 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] MT法を用いた深部低比抵抗体のイメージング能力について:超臨界地熱資源探査の例2021

    • Author(s)
      石須慶一・小川康雄・茂木透・山谷祐介・内田利弘
    • Organizer
      JPGU 2021
    • Related Report
      2021 Annual Research Report
  • [Presentation] 電磁アクロスデータの時系列解析2021

    • Author(s)
      芹田 創平・小川 康雄・曾 國軒・石須 慶一・國友 孝洋・南 拓人・市原 寛・Caldwell T.G.
    • Organizer
      JPGU 2021
    • Related Report
      2021 Annual Research Report
  • [Presentation] 電磁アクロスデータの時系列解析2021

    • Author(s)
      芹田 創平・小川 康雄・曾 國軒・石須 慶一・國友 孝洋・南 拓人・市原 寛・Caldwell T.G
    • Organizer
      2020年度 Conductivity Anomaly 研究会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Anatomy of active volcanic edifice at the Kusatsu-Shirane volcano, Japan, by magnetotellurics: hydrothermal implications for volcanic unrests2021

    • Author(s)
      小川康雄
    • Organizer
      2020年度 Conductivity Anomaly 研究会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Active Volcanic Edifice at the Kusatsu-Shirane Volcano, Japan, imaged by Magnetotellurics: Hydrothermal Implications for Volcanic Unrests2020

    • Author(s)
      Yasuo Ogawa , Kuo Hsuan Tseng, Nurhasan, Bulent Tank, Naoto Ujihara, Yoshimori Honkura , Akihiko Terada, Yoshiya Usui and Wataru Kanda
    • Organizer
      2020 AGU Fall meeting
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A tensor measurement with simultaneously transmitted Electromagnetic Accurately Controlled, Routinely Operated Signal System: utilization of distortionless response tensor,2020

    • Author(s)
      Kuo Hsuan Tseng, Yasuo Ogawa
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Anatomy of Active Volcanic Edifice at the Kusatsu-Shirane Volcano, Japan, by Magnetotelluric's: Hydrothermal Implications for Volcanic Unrests2020

    • Author(s)
      Kuo Hsuan Tseng, Yasuo Ogawa, Nurhasan Nurhasan, Sabri Bulent Tank, Yoshimori Honkura, Naoto Ujihara, Akihiko Terada, Yoshiya Usui, Wataru Kanda
    • Organizer
      JpGU-AGU Joint Meeting 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Remarks] home page

    • URL

      https://sites.google.com/view/yasuoogawatitech

    • Related Report
      2021 Annual Research Report

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Published: 2020-04-28   Modified: 2024-01-30  

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