HR: 1340h
AN: S33B-1313    [Abstracts]
TI: Polarization Study of ELF-Emissions at Pre-earthquakes Time
AU: * Wang, K
EM: ktwang@pssc.ncku.edu.tw
AF: Plasma and Space Science Center/Department of Physics,National Cheng Kung University, 1 University Rd., Tainan, 70101, Taiwan
AU: Wang, Y
EM: orchid57@ms14.hinet.net
AF: Plasma and Space Science Center/Department of Physics,National Cheng Kung University, 1 University Rd., Tainan, 70101, Taiwan
AU: Liu, J
EM: jyliu@jupiter.ss.ncu.edu.tw
AF: Institute of Space Science, National Central University, 300, Joongda Rd., Chung-Li, 32001, Taiwan
AU: Yang, W
EM: arround@yahoo.com.tw
AF: Institute of Space Science, National Central University, 300, Joongda Rd., Chung-Li, 32001, Taiwan
AU: Hsu, R
EM: rrhsu@phys.ncku.edu.tw
AF: Plasma and Space Science Center/Department of Physics,National Cheng Kung University, 1 University Rd., Tainan, 70101, Taiwan
AU: Su, H
EM: htsu@phys.ncku.edu.tw
AF: Plasma and Space Science Center/Department of Physics,National Cheng Kung University, 1 University Rd., Tainan, 70101, Taiwan
AU: Chen, Y
EM: ychen@stat.ncu.edu.tw
AF: Institute of Statistics, National Central University, 300, Joongda Rd., Chung-Li, 32001, Taiwan
AU: Hattori, K
EM: hattori@earth.s.chiba-u.ac.jp
AF: Marine Biosystems Research Center/Department of Earth Sciences, Faculty of Science,Chiba University, 1-33, Yayoi, Inage-ku, Chiba, 263-8522, Japan
AB: ELF-emissions events below 100Hz from Aug. 24, 2003 to July 9, 2004 were observed at ELF station in Lulin Observatory of Taiwan (120^o52' 25" E , 23^o28' 07" N, 2862m) [\it Wang \it et \it al., 2005]. Various types of emission patterns are identified. Statistical analysis of these ELF emissions and earthquakes (M ≥ 5.0) occurred in Taiwan at the same observational period have shown that both the occurrence rates and numbers of these emissions significantly enhanced within several days prior to earthquakes. In this presentation, polarizations of these events signals as well as the propagation directions of associated waves will be investigated. The polarization changes prior to occurrences of earthquakes will be the primary focus to study to understand how they are associated with source regions of earthquakes.
Reference
Wang, K., Y. C. Wang, H. T. Su, and R. R. Hsu, Low-Latitude ELF Emissions Below 100Hz Observed in Taiwan (2005), Eos Trans. AGU, 86(52), Fall Meet. Suppl., Abstract SM41B-1180.
DE: 0689 Wave propagation (2487, 3285, 4275, 4455, 6934)
DE: 6914 Electromagnetic noise and interference
DE: 6974 Signal processing (0674)
DE: 6984 Waves in plasma (7867)
DE: 7223 Earthquake interaction, forecasting, and prediction (1217, 1242)
SC: Seismology [S]
MN: 2007 Fall Meeting