JpGU-AGU Joint Meeting 2017

Presentation information

[JJ] Poster

M (Multidisciplinary and Interdisciplinary) » M-IS Intersection

[M-IS12] [JJ] Electromagnetic phenomena associated with seismic and volcanic activities

Thu. May 25, 2017 10:45 AM - 12:15 PM Poster Hall (International Exhibition Hall HALL7)

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)

[MIS12-P02] Ionospheric disturbance in D region possibly related to pre-earthquake activities observed by the DEMETER

*Hidetoshi Nitta1, Togo Shoho1, Masashi Kamogawa1, Jean-Jacques Berthelier4, Tetsuya Kodama2, Toshiyasu Nagao3 (1.Department of Physics, Tokyo Gakugei University, 2.Japan Aerospace Exploration Agency, 3.Tokai University, 4.LATMOS, France)

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.