Japan Geoscience Union Meeting 2016

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Poster

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

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

Wed. May 25, 2016 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

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.)

5:15 PM - 6:30 PM

[MIS08-P01] Study of pre-seismic ionospheric anomalies in the D region using the DEMETER burst data

*Shoho Togo1, Hidetoshi Nitta1, Masashi Kamogawa1, 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 Research Institute, The University of Tokyo)

Keywords: Earthquake, Subionospheric disturbance, DEMETER

We statistically investigate pre-seismic ionospheric disturbances by using the VLF electric field data of the DEMETER, following Nemec et al. (Geophys. Res. Lett., 2008; J. Geophys. Res.; 2009) and Pisa et al. (J. Geophys. Res., 2013). Our replicated analysis also showed that the background intensity of around 1.7 kHz electric field decreased within 4 hours before the mainshock with magnitude of more than 4.8, using the complete data set of the DEMETER, i.e., 6.5-year. In order to understand the physical mechanism of the depression of the background intensity, we selected orbit highly related to the decrease of the intensity for the event analysis from the whole data. We analyze the burst mode data of the VLF data in detail.