Research on Active monitoring of crustal state using phased array source

2007 Fiscal Year Final Research Report Summary

• Project/Area Number: 17340129
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Solid earth and planetary physics
• Research Institution: Nagoya University (2007); The University of Tokyo (2005-2006)
• Principal Investigator: YAMAOKA Koshun Nagoya University, Graduate School of Environmental Studies, Professor (70183118)
• Co-Investigator(Kenkyū-buntansha): WATANABE Toshiki Nagoya University, Graduate School of Environmental Studies, Associate Professor (50210935) ; SAEKI Masahiro Tokyo University of Science, Faculty of Science and Techmology, Assistant Professor (70385516) ; KUNITOMO Takahiro Shizuoka Uniersity, Faculty of Science, Visiting associate professor (40234463)
• Project Period (FY): 2005 – 2007
• Keywords: Earthquake / Volcano / Controlled source / Temporal change / Crustal structure

Research Abstract

We have investigated the efficiency of controlled seismic source with phased array for the active monitoring within the earth's crust. The purpose of the research is to investigate (1) the efficiency of the phased array, (2) efficiency of source and receiver array, (3) effect of heterogeneity of the structure and (4) detectability of temporal change with long-term operation.
To achieve these purpose, we have re-install the ACROSS (Accurately-Controlled Routine-Operated Signal System) vibrators in the Mikawa observatory of Nagoya University. The vibrator has been being operated in Kagamihara, in Gifu prefecture, and consists of four vibrator units. It was intended to generate a linear motion in arbitrary horizontal direction. As this function has been achieved in different way, we relocate the vibrator from original site to Toyohashi in order to investigate the effect of phased array. In Toyohashi site two vibrator units are separately deployed with 20m separation. The two units are operated in the same time and same frequency range with slight difference in center frequency. The operation is made using PCs that are synchronized to GPS time. The phased array requires several other tips for trouble-less operation, including newly-designed oil lubricator, signal transmission line, anti-vibration insulator, etc. After we have checked operation ability to fix the problem, we installed receiver arrays around the source with a distance of about one kilometer. We operated the source for two months to check the effect of source and receiver arrays. The result of analysis will be soon reported in papers and meetings.

Research Products

• [Journal Article] Time lapse approach in the study of earthquake generation-geophysical exploration of asperities-reflectors system(EARS)for interplate earthquake generation along subducting oceanic plate (2007)
  • Author(s): Kasahara, J., Tsuruga, K., Mikada, H., Yamaoka, K. and Fujii, N
  • Journal Title: Butsuri Tansa 59 Pages: 525-537
  • Description: 「研究成果報告書概要(和文)」より
  • Peer Reviewed
• [Journal Article] Continuous observation of seismic wave velocity and apparent velocity using a precise seismic array and ACROSS seismic source (2006)
  • Author(s): Saiga, A., Yamaoka, K., Kunitomo, T. and Watanabe, T.
  • Journal Title: Earth Planet Space 58 Pages: 993-1005
  • Description: 「研究成果報告書概要(和文)」より
  • Peer Reviewed
• [Journal Article] Continuous Active Seismic Observation using ACROSS source and Seimometer Array, (2006)
  • Author(s): Watanabe, T., Ikuta, R., Yamaoka. K., Soma, T. and Fujii, N.
  • Journal Title: Proceedings of the 8th SEGJ International Symposium, Pages: 369-372
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] データロガーLS7000の温度特性評価と専用プリアンプの製作. (2006)
  • Author(s): 生田領野・山岡耕春・見須裕美・藤井巌
  • Journal Title: 東京大学地震研究所 技術報告 12 Pages: 46-50
  • Description: 「研究成果報告書概要(和文)」より
  • Peer Reviewed
• [Journal Article] Phase ambiguity resolution based on Linear modeling of DD carrier phase. (2006)
  • Author(s): Saeki, M., Khosaka, T. and Kaneko, S.
  • Journal Title: Proceedings of ION GNSS06. Pages: 26-29
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Continuous observation of seismic wave velocity and apparent velocity using a precise seismic array and ACROSS seismic source, Earth (2006)
  • Author(s): Saiga, A., Yamaoka, K. Kunitomo, T. Watanabe, T
  • Journal Title: Planets Space 58,8 Pages: 993-1005
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Evaluation of temperature characteristics of a data logger LS-7000 and fabrication of preamplifier exclusive to the data logger (2006)
  • Author(s): Ikuta, R., Yamaoka, K. Misu, H. Fujii, I
  • Journal Title: Technical Research Report, Earthquake Research Institute Pages: 12
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Continuous Active Seismic Observation using ACROSS source and Seimometer Array (2006)
  • Author(s): Watanabe, T., Ikuta, R. Yamaoka, K. Soma, T. Fujii, N
  • Journal Title: Proceedings of the 8th SEGJ International Symposium Pages: 369-372
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Phase ambiguity resolution based on Linear modeling of DD carrier phase (2006)
  • Author(s): Saeki, M., Khosaka, T. Kaneko, S
  • Journal Title: Proceedings of ION GNSS06 Pages: 26-29
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Strategy of earthquake prediction research in Japan and the role of active monitoring. (2005)
  • Author(s): Yamaoka, K.
  • Journal Title: Proceedings of the Active Geophysical Monitoring of the earth lithosphere. 12-16 September, 2005 Novisibirsk, Russia, Pages: 28-31
  • Description: 「研究成果報告書概要(和文)」より
• [Journal Article] Strategy of earthquake prediction research in Japan and the role of active monitoring (2005)
  • Author(s): Yamaoka, K
  • Journal Title: Proceedings of the Active Geophysical Monitoring of the earth lithosphere Pages: 28-31
  • Description: 「研究成果報告書概要(欧文)」より
• [Journal Article] Monitoring of the State of Inter-plate coupling using reflection phase. Proceedings of the Active Geophysical (2005)
  • Author(s): Tsuruga, K., Y. Hasada, T. Kunitomo, J. Kasahara, R. Ikuta, T. Watanabe, K. Yamaoka, et. al.
  • Journal Title: Monitoring of the earth lithosphere Pages: 12-16
  • Description: 「研究成果報告書概要(欧文)」より
• [Presentation] Interpretation of frequency dependence in transfer functions acquired by seismic ACROSS (2007)
  • Author(s): Hasada, Y., Watanabe, T., Yamaoka, K., Itoh, H., Fujii, N., Kumazawa, M.
  • Organizer: American Geophysical Union Fall meeting
  • Place of Presentation: San Francisco
  • Year and Date: 2007-12-12
  • Description: 「研究成果報告書概要(和文)」より
• [Presentation] Temporal changes in emission characteristic of elastic wave by vibrator source and its correction (2007)
  • Author(s): Ikuta, R., Yamaoka, K., Watanabe, T.
  • Organizer: American Geophysical Union Fall meeting
  • Place of Presentation: San Francisco
  • Year and Date: 2007-12-12
  • Description: 「研究成果報告書概要(和文)」より
• [Presentation] Time-evolution of later phases in the transfer functions obtained by a permanent seismic source and receivers (ACROSS) (2007)
  • Author(s): Watanabe, T., Furukawa, T., Hasada, Y., Ikuta, R., Yamaoka, K
  • Organizer: American Geophysical Union Fall Meeting
  • Place of Presentation: San Francisco
  • Year and Date: 2007-12-12
  • Description: 「研究成果報告書概要(欧文)」より
• [Presentation] Interpretation of frequency dependence in transfer functions acquired by seismic ACROSS (2007)
  • Author(s): Hasada, Y., Watanabe, T., Yamaoka, K., Itoh, H., Fujii, N., Kumazawa, M
  • Organizer: American Geophysical Union Fall Meeting
  • Place of Presentation: San Francisco
  • Year and Date: 2007-12-12
  • Description: 「研究成果報告書概要(欧文)」より
• [Presentation] Temporal changes in emission characteristic of elastic wave by vibrator source and its correction (2007)
  • Author(s): Ikuta, R., Yamaoka, K., Watanabe, T
  • Organizer: American Geophysical Union Fall Meeting
  • Place of Presentation: San Francisco
  • Year and Date: 2007-12-12
  • Description: 「研究成果報告書概要(欧文)」より
• [Presentation] Hi-net 鳳来におけるアクロス連続デ タに見られる波群の時間変化, (2007)
  • Author(s): 古川俊之, 渡辺俊樹, 羽佐田葉子, 山岡耕春, 生田領野
  • Organizer: 日本地球惑星科学連合2007年大会
  • Place of Presentation: 千葉市
  • Year and Date: 2007-05-22
  • Description: 「研究成果報告書概要(和文)」より
• [Presentation] Temporal variation of ACROSS signal that is observed in Hi-net Horai (2007)
  • Author(s): Furukawa, T., Watanabe, T., Hasada, Y., Yamaoka, K., Ikuta, R
  • Organizer: JPGU annual meeting
  • Place of Presentation: Chiba, Japan
  • Year and Date: 2007-05-22
  • Description: 「研究成果報告書概要(欧文)」より
• [Presentation] Feasibility experiment for active. monitoring of inter-plate coupling in Tokai region using ACROSS (2006)
  • Author(s): Ikuta, R., Watanabe, T., Soma, T., Yamaoka, K., Kunitomo, K.
  • Organizer: American Geophysical Union Fall meeting
  • Place of Presentation: San Francisco
  • Year and Date: 2006-12-13
  • Description: 「研究成果報告書概要(和文)」より
• [Presentation] Time-evolution of later phases in the transfer functions obtained by a permanent seismic source and receivers(ACROSS) (2006)
  • Author(s): Watanabe, T., Furukawa, T., Hasada, Y., Ikuta, R., Yamaoka. K.
  • Organizer: American Geophysical Union, Fall meeting
  • Place of Presentation: San Francisco
  • Year and Date: 2006-12-13
  • Description: 「研究成果報告書概要(和文)」より
• [Presentation] Feasibility experiment for active monitoring of inter-plate coupling in Tokai region using ACROSS (2006)
  • Author(s): Ikuta, R., Watanabe, T., Soma, T., Yamaoka, K., Kunitomo, K
  • Organizer: American Geophysical Union Fall Meeting
  • Place of Presentation: San Francisco
  • Year and Date: 2006-12-13
  • Description: 「研究成果報告書概要(欧文)」より
• [Presentation] 短スパン地震計アレイを用いた愛知県(旧)鳳来町における中期連続地震観測とアクロス解析, (2006)
  • Author(s): 渡辺俊樹, 生田領野, 山岡耕春, 雑賀 敦, 宮島力雄, 相馬知征, 須藤法子, 柏木雅生, 藤井直之, 中道治久,
  • Organizer: 日本地球惑星科学連合2006年大会
  • Place of Presentation: 千葉市
  • Year and Date: 2006-05-18
  • Description: 「研究成果報告書概要(和文)」より
• [Presentation] 地震計アレイを用いた中期連続観測におけるアクロス震源からの弾性波のアレイ解析 (2006)
  • Author(s): 相馬知征, 渡辺俊樹, 生田領野, 山岡耕春, 宮島力雄, 藤井直之
  • Organizer: 日本地球惑星科学連合2006年大会
  • Place of Presentation: 千葉市
  • Year and Date: 2006-05-18
  • Description: 「研究成果報告書概要(和文)」より
• [Presentation] Temporal variation of ACROSS signal observed with short-span seismic array (2006)
  • Author(s): Watanabe, T., Ikuta, R., Yamaoka, K, Saiga A., Miyajima, R., Souma, T., Suto, N., Kashiwagi, M., Fujii, N., Nakamichi, H
  • Organizer: JPGU annual meeting
  • Place of Presentation: Chiba, Japan
  • Year and Date: 2006-05-18
  • Description: 「研究成果報告書概要(欧文)」より
• [Presentation] Array analysis for mid-term monitoring using ACROSS signal (2006)
  • Author(s): Soma, T., Watanabe, T., Ikuta, R., Yamaoka, K., Miyajima R, Fujii, N
  • Organizer: JPGU annual meeting
  • Place of Presentation: Chiba, Japan
  • Year and Date: 2006-05-18
  • Description: 「研究成果報告書概要(欧文)」より
• [Presentation] Feasibility experiment for Active Monitoring of Inter-plate Coupling in Tokai region.-A dense array measurement-, (2005)
  • Author(s): Watanabe, T., Ikuta, R., Soma, T., Saiga, A., Miyajima, R., Fujii, N., Yamaoka, K., Tsuruga, K., Kunitomo, T., Hasada, Y., Kasahara, J., Kumazawa, M., Satomura, M.,
  • Organizer: American Geophysical Union Fall meeting
  • Place of Presentation: San Francisco
  • Year and Date: 2005-12-06
  • Description: 「研究成果報告書概要(和文)」より
• [Presentation] Detection of Reflected Waves from Plate Boundary Using ACROSS Source and Seismic Array (2005)
  • Author(s): Soma, T., Watanabe, T., Ikuta, R., Saiga, A., Miyajima, R., Yamaoka, K., Tsuruga, K., Kunitomo, T., Hasada, Y., Kasahara, J., Satomura, M., Kumazawa, M., Fujii, N.,
  • Organizer: American Geophysical Union Fall meeting
  • Place of Presentation: San Francisco
  • Year and Date: 2005-12-06
  • Description: 「研究成果報告書概要(和文)」より
• [Presentation] Monitoring Experiment in Tokai, Japan: ACROSS source designed for a phased array, (2005)
  • Author(s): Yamaoka, K., Watanabe, T., Fujii, N., Ikuta, R., Miyajima, R.
  • Organizer: American Geophysical Union Fall meeting
  • Place of Presentation: San Francisco
  • Year and Date: 2005-12-06
  • Description: 「研究成果報告書概要(和文)」より
• [Presentation] Feasibility experiment for Active Monitoring of Inter-plate Coupling in Tokai region (2005)
  • Author(s): Watanabe, T., Ikuta, R., Soma, T., Saiga, A., Miyajima, R., Fujii, N., Yamaoka, K., Tsuruga, K., Kunitomo, T., Hasada, Y., Kasahara, J., Kumazawa, M, Satomura, M
  • Organizer: -A dense array measurement-, American Geophysical Union Fall Meeting
  • Place of Presentation: San Francisco
  • Year and Date: 2005-12-06
  • Description: 「研究成果報告書概要(欧文)」より
• [Presentation] Detection of Reflected Waves from Plate Boundary Using ACROSS Source and Seismic Array (2005)
  • Author(s): Soma, T., Watanabe, T., Ikuta, R., Saiga, A., Miyajima, R., Yamaoka, K., Tsuruga, K., Kunitomo, T., Hasada, Y., Kasahara, J., Satomura, M., Kumazawa, M., Fujii, N
  • Organizer: American Geophysical Union Fall Meeting
  • Place of Presentation: San Francisco
  • Year and Date: 2005-12-06
  • Description: 「研究成果報告書概要(欧文)」より
• [Presentation] Experiment in Tokai, Japan : ACROSS source designed for a phased array (2005)
  • Author(s): Yamaoka, K., Watanabe, T., Fujii, N., Ikuta, R., Miyajima, R
  • Organizer: American Geophysical Union Fall Meeting
  • Place of Presentation: San Francisco
  • Year and Date: 2005-12-06
  • Description: 「研究成果報告書概要(欧文)」より
• [Remarks] 「研究成果報告書概要(和文)」より
  • URL: http://www.seis.nagoya-u.ac.jp/yamaoka/research/across/across-j.html