Towards remote monitoring of submarine volcanic activities(Fostering Joint International Research)

2019 Fiscal Year Annual Research Report

• Project/Area Number: 15KK0177
• Research Institution: Kobe University
• Principal Investigator: 杉岡 裕子 神戸大学, 海洋底探査センター, 教授 (00359184)
• Project Period (FY): 2016 – 2019
• Keywords: 離島火山活動 / 海底火山活動 / リモートモニタリング / 水中音波

Outline of Annual Research Achievements

最終年度の本年度は、海域火山のリモートモニタリングの実現に向け、以下の二つのテーマにおいて成果を上げることができた。
（１）海中音波を用いたモニタリング手法の開発
共同研究先の国連機関である包括的核実験禁止条約機構（CTBTO）が主催の国際水中音波ワークショップ2019（7月8日ー11日）に出席し、同機関が所有するハイドロフォン国際観測網データのアクセス方法並びにデータ解析手法の共有化を確立することができた。これは、vDECと呼ばれる仮想データサーバーを共有するものであり、水中音波解析に有効なツールが充実しており、初期解析はその場で行うことができ大変便利なシステムである。更に、先方にフィードバックすることも可能であり、機能の付与も可能である。
（２）海中浮遊式ハイドロフォンシステムによる海中音波観測
ニース大学がOSEAN社（フランス）と共同開発観測装置の海中浮遊型ハイドロフォンシステム（MERMAID）を用い、日仏中米共同観測を実施した。本国際共同研究は、2016年の国際共同研究計画「Earth Scope-Oceans」の発足を契機とし（代表：ニース大学Nolet教授）、その後もメンバー間での議論を重ね、実際の観測では、2018年4月には神戸大学所有の練習船「深江丸」を用いた試験観測を実施し、2019年には日本および米仏がそれぞれ独自に小規模展開した後、今回は全メンバー国共同での大規模展開の実施に至った。本観測は、2019年8月から9月に実施され、これによって50台ものMERMAIDシステムが南太平洋（南緯0ー30度、西経100ー180度）に展開された。バッテリー容量から5ー6年の観測期間が見込まれており、その間に起きるグローバル地震波形が準リアルタイムで取得されることになり、グローバル地震波トモグラフィーにおける解像度均一化ひいては地球内部構造モデルの大幅な改善が期待できる。

Research Products

• [Int'l Joint Research] アメリカ海洋大気庁(NOAA)(米国) (2018)
  • Year and Date: 2018-12-14 – 2018-12-19 | 2019-12-072019-12-15
  • Country Name: U.S.A.
  • Counterpart Institution: アメリカ海洋大気庁(NOAA)
  • Co-investigator Overseas: Robert Dziak
  • Department: PML
  • Job Title: Program Manager
• [Int'l Joint Research] 包括的核実験禁止条約機構（CTBTO）(オーストリア) (2017)
  • Year and Date: 2017-06-24 – 2017-07-05 | 2018-03-162018-04-04 | 2019-07-072019-07-12
  • Country Name: AUSTRIA
  • Counterpart Institution: 包括的核実験禁止条約機構（CTBTO）
  • Co-investigator Overseas: Le Bras Ronan
  • Department: International Data Center
  • Job Title: Project manager
• [Journal Article] Detection of Ocean Internal Tide Source Oscillations on the Slope of Aogashima Island, Japan (2019)
  • Author(s): Fukao Y.、Miyama T.、Tono Y.、Sugioka H.、Ito A.、Shiobara H.、Yamashita M.、Varlamov S.、Furue R.、Miyazawa Y.
  • Journal Title: Journal of Geophysical Research: Oceans Volume: 124 Pages: 4918～4933
  • DOI: 10.1029/2019JC014997
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Shallow Nonvolcanic Tremor Activity and Potential Repeating Earthquakes in the Chile Triple Junction: Seismic Evidence of the Subduction of the Active Nazca-Antarctic Spreading Center (2019)
  • Author(s): Saez Miguel、Ruiz Sergio、Ide Satoshi、Sugioka Hiroko
  • Journal Title: Seismological Research Letters Volume: 90 Pages: 1740-1747
  • DOI: 10.1785/0220180394
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Event Size Distribution of Shallow Tectonic Tremor in the Nankai Trough (2019)
  • Author(s): Nakano Masaru、Yabe Suguru、Sugioka Hiroko、Shinohara Masanao、Ide Satoshi
  • Journal Title: Geophysical Research Letters Volume: 46 Pages: 5828～5836
  • DOI: 10.1029/2019GL083029
  • Peer Reviewed / Open Access
• [Journal Article] Surface wave tomography for the Pacific Ocean incorporating seafloor seismic observations and plate thermal evolution (2019)
  • Author(s): Isse Takehi、Kawakatsu Hitoshi、Yoshizawa Kazunori、Takeo Akiko、Shiobara Hajime、Sugioka Hiroko、Ito Aki、Suetsugu Daisuke、Reymond Dominique
  • Journal Title: Earth and Planetary Science Letters Volume: 510 Pages: 116～130
  • DOI: 10.1016/j.epsl.2018.12.033
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Configuration and structure of the Philippine Sea Plate off Boso, Japan: constraints on the shallow subduction kinematics, seismicity, and slow slip events (2019)
  • Author(s): Ito Aki、Tonegawa Takashi、Uchida Naoki、Yamamoto Yojiro、Suetsugu Daisuke、Hino Ryota、Sugioka Hiroko、Obana Koichiro、Nakahigashi Kazuo、Shinohara Masanao
  • Journal Title: Earth, Planets and Space Volume: 71 Pages: 111
  • DOI: 10.1186/s40623-019-1090-y
  • Peer Reviewed / Open Access
• [Presentation] Finite frequency S wave tomography model beneath the Ontong Java Plateau using data recorded by broadband ocean bottom seismographs (2019)
  • Author(s): Misaki Horiuchi, Hiroko Sugioka, Masayuki Obayashi, Daisuke Suetsugu, Hajime Shiobara, Aki Ito, Yasushi Ishihara, Satoru Tanaka, Takehi Isse, Takashi Tonegawa, Junko Yoshimitsu, Takumi Kobayashi
  • Organizer: Japan Geoscience Union Meeting 2019
  • Int'l Joint Research
• [Presentation] Installation of a floating hydrophone system within the SOFAR channel (2019)
  • Author(s): Hiroko Sugioka, Masayuki Obayashi
  • Organizer: Japan Geoscience Union Meeting 2019
  • Int'l Joint Research
• [Presentation] New Constraints on Seismological Structures of the Oceanic Asthenospher (2019)
  • Author(s): Nozomu Takeuchi, Hitoshi Kawakatsu, Hajime Shiobara, Takehi Isse, Hiroko Sugioka, Aki Ito, Hisashi Utada
  • Organizer: Japan Geoscience Union Meeting 2019
  • Int'l Joint Research
• [Presentation] Shear wave structure of the upper mantle beneath the Ontong Java Plateau (2019)
  • Author(s): Takehi Isse, Daisuke Suetsugu, Hajime Shiobara, Hiroko Sugioka, Aki Ito, Yasushi Ishihara, Satoru Tanaka, Masayuki Obayashi, Takashi Tonegawa, Junko Yoshimitsu, Takumi Kobayashi, Kazunori Yoshizawa
  • Organizer: Japan Geoscience Union Meeting 2019
  • Int'l Joint Research
• [Presentation] これまでのKOBEC鬼界カルデラ航海・研究のまとめ (2019)
  • Author(s): 島伸和,松野哲男,清杉孝司,清水賢,中岡礼奈,鈴木桂子,瀬戸康友,佐野守,森田結子,井和丸光,両角春寿,堀内美咲,西村公宏,市原寛,林和輝,廣瀬時,金子克哉,山口寛登,沖園雄希,杉岡裕子,中東和夫,山本揚二朗,香田達也,小平秀一,巽好幸
  • Organizer: Japan Geoscience Union Meeting 2019
• [Presentation] チリ三重会合点におけるMR18-06'EPIC'航海レグ2調査概要 (2019)
  • Author(s): 木下正高,岩森光,西川友章,安間了,Lagarrigue Sofia,阿部なつ江,横山由香,Espinosa Andres,Cortes Alessandra,Prado Gabriela,Bascuan Ivan,原口悟,太田耕輔,折橋裕二,中尾魁史,沼田翔伍,塩原肇,杉岡裕子,伊藤亜妃,Prez-Estay Nicolas
  • Organizer: Japan Geoscience Union Meeting 2019
• [Presentation] 海中浮遊ロボットMERMAIDによる地震観測 (2019)
  • Author(s): Masayuki Obayashi, Hiroko Sugioka
  • Organizer: Japan Geoscience Union Meeting 2019
• [Presentation] 海底地震観測を用いた鬼界カルデラで発生する地震活動 (2019)
  • Author(s): 戸康友,杉岡裕子,山本揚二朗,高橋努
  • Organizer: Japan Geoscience Union Meeting 2019
• [Presentation] 鬼界カルデラのMT観測データの解析 (2019)
  • Author(s): 廣瀬時,松野哲男,島伸和,沖園雄希,市原寛,杉岡裕子,巽好幸
  • Organizer: Japan Geoscience Union Meeting 2019
• [Presentation] 鬼界カルデラ下の3次元電気比抵抗構造探査 (2019)
  • Author(s): 松野哲男,廣瀬時,沖園雄希,島伸和,市原寛,杉岡裕子,巽好幸
  • Organizer: Japan Geoscience Union Meeting 2019
• [Presentation] 漂流フロートによる津波起因水中圧力変化観測 (2019)
  • Author(s): 大林政行,綿田辰吾,杉岡裕子
  • Organizer: Japan Geoscience Union Meeting 2019
• [Presentation] P-wave Velocity Structures beneath the Ontong Java Plateau (2019)
  • Author(s): M. Obayashi,J. Yoshimitsu,D. Suetsugu,H. Shiobara,H. Sugioka,A. Ito,T. Isse,Y. Ishihara,S. Tanaka,T. Tonegawa,T. Kobayashi
  • Organizer: The 27th IUGG General Assembly
  • Int'l Joint Research
• [Presentation] Surface Wave Tomography for the Pacific Ocean Incorporating Seafloor Seismic Observations and Plate Thermal Evolution (2019)
  • Author(s): T. Isse,H. Kawakatsu,K. Yoshizawa,A. Takeo,H. Shiobara,H. Sugioka,A. Ito,D. Suetsugu,D. Reymond
  • Organizer: The 27th IUGG General Assembly
  • Int'l Joint Research
• [Presentation] New Era of Ocean Bottom Broadband Seismology with Penetrator Sensor System of the Autonomous BBOBS-NX (NX-2G) (2019)
  • Author(s): H. Shiobara,A. Ito,H. Sugioka,M. Shinohara
  • Organizer: The 27th IUGG General Assembly
  • Int'l Joint Research
• [Presentation] Ocean Bottom Electromagnetometers Recorded Signals Possibly Associated with Eruptive and Non-eruptive Events of Nishinoshima Island Volcano, Japan (2019)
  • Author(s): K. Baba,N. Tada,H. Ichihara,Y. Hamano,H. Sugioka,T. Koyama,A. Takagi,M. Takeo
  • Organizer: The 27th IUGG General Assembly
  • Int'l Joint Research
• [Presentation] A new floatlng hydrophone instrument in the SOFAR channel (2019)
  • Author(s): H. Sugioka,M. Obayashi
  • Organizer: The 27th IUGG General Assembly
  • Int'l Joint Research
• [Presentation] Continuous imaging of the subducting Pacific plate under Japan using receiver function analysis of the amphibious array data (2019)
  • Author(s): HyeJeong Kim,Hitoshi Kawakatsu,Takeshi Akuhara,Masanao Shinohara,Hajime Shiobara,Hiroko Sugioka,Ryota Takagi
  • Organizer: AGU Fall Meeting 2019
  • Int'l Joint Research
• [Presentation] Mobile Earthquake Recording in Marine Areas by Independent Divers:New features-and Results from SPPIM, its First Big Deployment in the South Pacific (2019)
  • Author(s): Yann Hello,Joel D Simon,Yongshun John Chen,Masayuki Obayashi\,,Hiroko Sugioka,Olivier Philippe,Frederik Simons,Guust Nolet
  • Organizer: AGU Fall Meeting 2019
  • Int'l Joint Research
• [Presentation] P-wave upper mantle structures beneath the Ontong Java Plateau (2019)
  • Author(s): Masayuki Obayashi,Junko Yoshimitsu,Daisuke Suetsugu,Hajime Shiobara,Hiroko Sugioka,Aki Ito,Takehi Isse,Yasushi Ishihara,Satoru Tanaka,Takashi Tonegawa,Takumi Kobayashi
  • Organizer: AGU Fall Meeting 2019
  • Int'l Joint Research
• [Presentation] Shear wave upper mantle structure beneath the Ontong Java Plateau (2019)
  • Author(s): Takahi Isse,Daisuke Suetsugu,Akira Ishikawa,Hajime Shiobara,Hiroko Sugioka,Aki Ito,Yuki Kawano,Kazunori Yoshizawa,Yasushi Ishihara,Satoru Tanaka,Masayuki Obayashi,Takashi Tonegawa,Junko Yoshimitsu,Takumi Kobayashi
  • Organizer: AGU Fall Meeting 2019
  • Int'l Joint Research
• [Presentation] Inversion of Longer Period OBS Waveforms for P Structures in the Oceanic Lithosphere and Asthenosphere (2019)
  • Author(s): Nozomu Takeuchi,Hitoshi Kawakatsu,Hajime Shiobara,Takehi Isse,Hiroko Sugioka,Aki Ito,Hisashi Utada
  • Organizer: AGU Fall Meeting 2019
  • Int'l Joint Research