Anomalies of magnetic field of the Earth during high-magnitude earthquake have many times been addressed in the scientific literature. The earlier research of magnetic anomalies mostly used data of magnetic recording at points nearby epicenters of earthquakes. Recently, researchers lay emphasis on the 2011 Tohoku earthquake of moment magnitude Mw 9.0 occurred on the east coast of Honshu (Japan, epicenter at 38.32 degrees North latitude and 142.37 degrees East longitude). This study focuses on geomagnetic perturbations far away from the epicenter of the Great East-Japan Earthquake and uses observatory data from international network Intermagnet and Geophysical Observatory Mikhnevo. Processing and analysis of the instrumental observation data shows that initiation of earthquakes is accompanied by variations in the magnetic field. These anomalies are distinct and recorded at great distances from the epicenter. Records of anomalous magnetic signals can be used in prediction algorithms of earthquakes and rock bursts. On the other hand, perturbations during storms confine practical importance of predictive monitoring as magnetospheric and ionospheric disturbances considerably exceed lithospheric disturbances.

For citation: Riabova S.A. Geomagnetic effect of the strong 2011 Tohoku earthquakeGornyy informatsionno-analiticheskiy byulleten'. 2019;4:137-151. [In Russ]. DOI: 10.25018/0236-1493-2019-04-0-137-151.


Anomalies of magnetic field of the Earth, earthquake epicenter, 2011 Tohoku earthquake, seismomagnetic effect, Intermagnet international network observatories, Geophysical Observatory Mikhnevo.

Issue number: 4
Year: 2019
ISBN: 0236-1493
UDK: 550.344.385
DOI: 10.25018/0236-1493-2019-04-0-137-151
Authors: Riabova S. A.

About authors: S.A. Riabova, Junior Researcher, e-mail:, Institute of Geosphere Dynamics of Russian Academy of Sciences, 119334, Moscow, Russia.


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