Criticality features in ULF magnetic fields prior to the 2011 Tohoku earthquake

  title={Criticality features in ULF magnetic fields prior to the 2011 Tohoku earthquake},
  author={Masashi Hayakawa and Alexander Schekotov and Stelios M. Potirakis and K. Eftaxias},
  journal={Proceedings of the Japan Academy. Series B, Physical and Biological Sciences},
  pages={25 - 30}
The criticality of ULF (Ultra-low-frequency) magnetic variations is investigated for the 2011 March 11 Tohoku earthquake (EQ) by natural time analysis. For this attempt, some ULF parameters were considered: (1) Fh (horizontal magnetic field), (2) Fz (vertical magnetic field), and (3) Dh (inverse of horizontal magnetic field). The first two parameters refer to the ULF radiation, while the last parameter refers to another ULF effect of ionospheric signature. Nighttime (L.T. = 3 am ± 2 hours) data… Expand
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