2005 Fiscal Year Final Research Report Summary
Basic study for electromagnetic phenomena preceded by earthquakes in and around Tokai and Kanto regions
| Project/Area Number |
14208045
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Natural disaster science
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| Research Institution | Tokai University |
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Principal Investigator |
NAGAO Toshiyasu Tokai University, Institute of Oceanic Res.& Develop., Professor, 海洋研究所, 教授 (20183890)
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| Co-Investigator(Kenkyū-buntansha) |
SAYANAGI Keizo Tokai University, Inst.of Oceanic Res.& Develop., Associate Professor, 海洋研究所, 助教授 (40332308)
KUSUMOTO Shigekazu Tokai University, School of Marine Science & Technology, Associate Professor, 海洋学部, 助教授 (50338761)
HATTORI Katsumi Chiba Univ., Marine Biosystem Research Center, Associate Professor, 海洋バイオシステム研究センター, 助教授 (60244513)
KATO Teruyuki University of Tokyo, Earthquake Research Institute, Professor, 地震研究所, 教授 (80134633)
KAMOGAWA Masashi Tokyo Gakugei Univ., Faculty of Education, Research Associate, 教育学部, 助手 (00329111)
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| Project Period (FY) |
2002 – 2005
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| Keywords | precursors / earthquake prediction / electromagnetic phenomena / crustal deformation / EM-ACROSS / VHF / VLF / ULF |
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| Research Abstract |
We continuously operate electromagnetic monitoring stations in and around Tokai and Kanto regions with good conditions. Concerning crustal deformation observations, we deployed about sixty GPS stations during the research period, which were supported by a different budget to monitor the Tokai slow slip event. Furthermore, we continued fundamental experiment of electromagnetic ACROSS, which is considered to be a promising method to monitor the temporal change of the underground. In this experiment, we succeeded to detect the signal by data stacking of two weeks in a remote station which was 40km away from the signal source of 440Am with the dipole moment. Concerning the underwater realtime monitoring of the electromagnetic fields, we deployed the three-component magnetometer and two-component electric field meter off the coast of Hatsushima Island in cooperation with JAMSTEC. At this moment, we succeeded to monitor more than one year with high-sampling rate (8Hz) and detected co-seismic electromagnetic changes clearly. Through the observation, we now conclude that the most promising device to detect the precursory changes in DC-ULF ranges is three-component magnetometer.
Japanese Island, especially central Japan and the Tokyo areas, it is dominant that a lot of artificial noises mainly on the leakage current from DC-driven trains. Therefore, it is very difficult to obtain good quality of data. Through the observation periods, we developed some noise reduction methods (Principal Component Analysis ; PCA, Independent Component Analysis ; ICA, Weiner filter technique, Detrend Fluctuation Analysis and so on. Concerning the data disclosure, we developed a lot of preliminary analyzing programs which can operate on the website. At this moment, some observation points are controlled by using IP address system.
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Research Products
(89 results)
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[Journal Article] Magnetic and electric field monitoring of Taal volcano, Philippines. Part 1 : Magnetic measurements2006
Author(s)
Harada, M., J.P.Sabit, Y.Sasai, P.K.Alanis, J.M.Cordon Jr., E.G.Corpus, J.Zlotnicki, T.Nagao, J.T.Purongbayan
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Journal Title
Proc. Japan Acad.,Ser. B Vol 81,No.7
Pages: 261-266
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Magnetic and electric field monitoring of Taal volcano, Philippines Part I : Magnetic measurements2005
Author(s)
Harada, M., J.P.Sabit, Y.Sasai, P.K.Alanis, J.M.Cordon Jr., E.G.Corpuz, J.Zlotnicki, T.Nagao, J.T.Punongbayan
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Journal Title
Proc.Japan Acad., Ser.B Vol.81, No.7
Pages: 261-266
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Atmospheric Field Variation before the March 31, 2002 M6.8 Earthquake in Taiwan2004
Author(s)
Kamogawa, M., J.Y.Liu, H.Fujiwara, Y.J.Chuo, Y.B.Tsai, K.Hattori, T.Nagao, S.Uyeda, Y.Ohtsuki
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Journal Title
Terrestrial, Atmospheric and Oceanic Sciences (TAO) Vol. 15, No. 3
Pages: 397-412
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Development of real-time observation system of electromagnetic fields at the seafloor2004
Author(s)
Sayanagi, K., Nagao, T., Watabe, I., Ikurumi Yamaguchi, T., Onishi, N., Ichikita, T., Takamura, N.
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Journal Title
Bull. Inst. of Oceanic Res. and Dev., TokaiUniversity 25
Pages: 55-66
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Atmospheric anomalies observed during earthquake occurrences2004
Author(s)
H.Fujiwara, M.Kamogawa, M.Ikeda, J.Y.Liu, H.Sakata, Y.I.Chen, H.Ofuruton, S.Muramatsu, Y.J.Chuo, Y.H.Ohtsuki
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Journal Title
Geophys. Res. Left. 31
Pages: L17110, doi:10.1029/20 04GL019865
Description
「研究成果報告書概要(和文)」より
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[Journal Article] ULF geomagnetic field measurements in Japan and some recent results associated with Iwateken Nairiku Hokubu Earthquake in 19982004
Author(s)
Hattori, K., Takahashi, I., Yoshino, C., Isezaki, N., Iwasaki, H., Harada, M., Kawabata, K., Kopytenko, E., Kopytenko, Y., Maltsev, P., Korepanov, V., Molchanov, O., Hayakawa, M., Noda, Y., Nagao, T., Uyeda, S.
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Journal Title
Physics and Chemistry of Earth 29
Pages: 481-494
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Atmospheric Field Variation before the March 31,2002 M6.8 Earthquake in Taiwan2004
Author(s)
Kamogawa, M., J.Y.Liu, H.Fujiwara, Y.J.Chuo, Y.B.Tsai, K.Hattori, T.Nagao, S.Uyeda, Y.Ohtsuki
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Journal Title
Terrestrial, Atmospheric and Oceanic Sciences (TAO) Vol.15, No.3
Pages: 397-412
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Development of real-time observation system of electromagnetic fields at the seafloor2004
Author(s)
Sayangai, K., Nagao, T., Watabe, I., Ikurumi Yamaguchi, T., Onishi, N., Ichikita, T., Takamura, N.
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Journal Title
Bull.Inst.of Oceanic Res. and Dev. (Tokai University) 25
Pages: 55-66
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Atmospheric anomalies observed during earthquake occurrences2004
Author(s)
Fujiwara, H., M.Kamogawa, M.Ikeda, J.Y.Liu, H.Sakata, Y.I.Chen, H.Ofuruton, S.Muramatsu, Y.J.Chuo, Y.H.Ohtsuki
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Journal Title
Geophys.Res.Lett. 31,L17110
Pages: doi:10.1029/2004GL019865
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] ULF geomagnetic field measurements in Japan and some recent results associated with Iwateken Nairiku Hokubu Earthquake in 19982004
Author(s)
Hattori, K., Takahashi, I., Yoshino, C., Isezaki, N., Iwasaki, H., Harada, M., Kawabata, K., Kopytenko, E., Kopytenko, Y., Maltsev, P., Korepanov, V., Molchanoc, O., Hayakawa, M., Noda, Y., Nagao, T., Uyeda, S.
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Journal Title
Physics and Chemistry of the Earth 29
Pages: 481-494
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Electric and Magnetic phenomena observed before the volcano-seismic activity 2000 in the Izu islands region, Japan2002
Author(s)
Uyeda, S., Hayakawa, M., Nagao, T., Molchanov, O., Hattori, K., Orihara, Y., Gotoh, K., Akinaga, Y., Tanaka, H.
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Journal Title
Proceedings of the US National Academy of Science 99
Pages: 7352-7355
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Electromagnetic anomalies associated with 1995 KOBE earthquake2002
Author(s)
Nagao, T., Enomoto, Y., Fujinawa, Y., Hata, M., Hayakawa, M., Huang, Q., Izutsu, J., Kushida, Y., Maeda, K., Oike, K., Uyeda, S., Yoshino, T.
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Journal Title
J. Geodynamics 33
Pages: 401-411
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Electromagnetic anomalies associated with 1995 KOBE earthquake2002
Author(s)
Nagao, T., Enomoto, Y., Fujinawa, Y., Hata, M., Hayakawa, M., Huang, Q., Izutsu, J., Kushida, Y., Maeda, K., Oike, K., Uyeda, S., Yoshino, T.
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Journal Title
J.Geodynamics 33
Pages: 401-411
Description
「研究成果報告書概要(欧文)」より
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