Ultra-low-frequency magnetic field depression for three huge oceanic earthquakes in Japan and in the Kurile islands

Author

Schekotov, Alexander ; Hayakawa, Masashi

Author_Institution

Inst. of Phys. of the Earth, Moscow, Russia

fYear

2014

fDate

12-16 May 2014

Firstpage

143

Lastpage

146

Abstract

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.

Keywords

disasters; earthquakes; geomorphology; magnetic field effects; Earth´s surface; Japan earthquake; Kurile islands; ULF depressions; amplitude reduction; sea bed; subduction region; three huge oceanic earthquakes; ultralow-frequency magnetic field depression; universal phenomenon; Earth; Earthquakes; Electromagnetics; Fluctuations; Magnetic field measurement; Magnetic fields; Magnetosphere; EQ precursor; EQ prediction; ULF magnetic field depression; oceanic EQs;

fLanguage

English

Publisher

ieee

Conference_Titel

Electromagnetic Compatibility, Tokyo (EMC'14/Tokyo), 2014 International Symposium on

Conference_Location

Tokyo

Type

conf

Filename

6997090