Japan Geoscience Union Meeting 2016

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Oral

Symbol M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS08] Electromagnetic phenomena associated with seismic and volcanic activities

Wed. May 25, 2016 3:30 PM - 5:00 PM Convention Hall B (2F)

Convener:*Tetsuya Kodama(Research Unit I, Research and Development Directorate, Japan Space Exploration Agency), Yasuhide Hobara(Graduate School of Information and Engineering Department of Communication Engineering and Informatics, The University of Electro-Communications), Toshiyasu Nagao(Institute of Oceanic Research and development, Tokai University), Masashi Hayakawa(Hayakawa Institute of Seismo Electromagnetics, Co., Ltd.), Chair:Toshiyasu Nagao(Institute of Oceanic Research and development, Tokai University), Tetsuya Kodama(Research Unit I, Research and Development Directorate, Japan Space Exploration Agency)

4:00 PM - 4:15 PM

[MIS08-03] Ionospheric disturbance in D region possibly related to pre-earthquake activities observed by the DEMETER

*Hidetoshi Nitta1, Masashi Kamogawa1, Shoho Togo1, Jean-Jacques Berthelier2, Tetsuya Kodama3, Toshiyasu Nagao4 (1.Department of Physics, Tokyo Gakugei University, 2.LATMOS, France, 3.Earth Observation Research Center, Space Applications Mission Directorate, Japan Space Exploration Agency, 4.Earthquake Prediction Research Center, Tokai University)

Keywords:Earthquake, Ionosphere, DEMETER

A decrease of electric field at the 1.7 kHz, i.e., VLF electromagnetic waves, within 4 hours before neighboring earthquake (EQ) with the magnitude of more than 4.8 was statistically shown through the data set of in-situ satellite measurement according to French groups. We found that the intensity originating from the whistler waves in the frequency of more than cutoff decreased in the orbit near the epicenter. The interpretation of the intensity decrease is due to the electron density increase in D region over the epicenter.