On the Ultra-Low-Frequency Magnetic Field Depression for Three Huge Oceanic Earthquakes in Japan and in the Kurile Islands

M. Hayakawa, A. Schekotov, E. Fedorov, Y. Hobara


The depression (reduction in amplitude) of ULF (ultra-low-frequency) magnetic field variations observed on the Earth’s surface is found for the recent huge Japan earthquake (EQ) (magnitude (M) ~ 9.0) on March 11, 2011 which is a typical oceanic EQ of the plate type. In order to confirm the presence of such a ULF depression, we have also studied the additional two huge oceanic EQs in the Kurile islands (M@8), and similar ULF depressions have also been detected. This suggests that such a ULF depression seems to be a universal phenomenon for huge (M=8-9) EQs even occurred in the sea bed of subduction region.

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DOI: https://doi.org/10.5539/esr.v2n1p33


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