The ionospheric precursor to the 2011 march 11 earthquake as based on the Japan-pacific subionospheric VLF/LF network observation von M. Hayakawa, Y. Hobara, A. Rozhnoi, M. Solovieva, K. Ohta, J. Izutsu, T. Nakamura, Y. Yasuda, H. Yama-guchi, Y. Kasahara

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