| Project/Area Number |
15403012
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Space and upper atmospheric physics
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| Research Institution | The University of Electro-Communications |
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Principal Investigator |
HAYAKAWA Masashi UEC, Dept.of Electro-Communications, Professor, 電気通信学部, 教授 (80023688)
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| Co-Investigator(Kenkyū-buntansha) |
ANDO Yoshiaki UEC, Dept. of Electro-Communications, Assistant Professor, 電気通信学部, 助教授 (30323877)
OHTA Kenji Chubu University, Dept. of Electronics and Information, Professor, 工学部, 教授 (10131161)
HATTORI Katsumi Chiba University, Marine Biosystem Res.Center, Assistant Professor, 理学部, 助教授 (60244513)
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| Project Period (FY) |
2003 – 2005
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| Project Status |
Completed (Fiscal Year 2005)
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| Budget Amount *help |
¥15,400,000 (Direct Cost: ¥15,400,000)
Fiscal Year 2005: ¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2004: ¥4,400,000 (Direct Cost: ¥4,400,000)
Fiscal Year 2003: ¥8,000,000 (Direct Cost: ¥8,000,000)
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| Keywords | Earthquake prediction / ULF emissions / Subionospheric VLF propagation / Ionospheric perturbation / Lithosphere-atmosphere-ionosphere coupling / 地震 / 電磁気現象 / 電離圏擾乱 / VLF送信局電波 / 大気圏擾乱 |
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| Research Abstract |
The main results can be summarized as follows.
(1)Data collection and analysis of observational data in Japan
Two important physical parameters are studied extensively : (1)ULF emissions and (2)ionospheric perturbations associated with earthquakes. Event studies have been performed for the 2004 Niigata earthquake, for which we have observed clear precursory effect of ULF emissions as determined by direction finding at Nagoya and we could detect clear precursory ionospheric perturbations on the JJY-Kochi path. Another large earthquake, Indonesia Sumatra earthquake was studied ; we could identify both ULF emissions and ionospheric perturbations for this earthquake. Further, a statistical study further on the correlation between ionospheric perturbations and earthquakes has been undertaken with a good success.
(2)VLF observation in Italy, Greece and Taiwan and the data analysis
The VLF observations in these three countries are going good, and we have been continuing the data analysis.
(3)Study of lithosphere-atmosphere-ionosphere coupling
We have suggested the atmospheric gravity waves as the most likely candidate for this coupling, as evidenced from the spectral analysis of VLF amplitude fluctuation. Our extensive ground-based data have been coordinated with the French DEMETER satellite data to study further the mechanism of lithosphere-atmosphere-ionosphere coupling.
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