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Izvestiya, Physics of the Solid Earth

, Volume 55, Issue 6, pp 811–820 | Cite as

Geomagnetic Variations during Strong Earthquakes

  • A. A. SpivakEmail author
  • S. A. Riabova
Article

Abstract—We analyze the geomagnetic effect caused by the strong earthquakes using the data from the Geophysical Observatory “Mikhnevo” (MHV) of Institute of Geosphere Dynamics of Russian Academy of Sciences (IDG RAS) and from a number of observatories of the international INTERMAGNET network. It is shown that seismic events are accompanied by characteristic variations in the Earth’s magnetic field. These induced geomagnetic variations contain a clearly pronounced short-period component with a period of ~0.5–0.8 min which is recorded during shallow earthquakes and a long-period component (~5–20 min) observed in the most cases. The maximum amplitudes of the induced geomagnetic variations are ~1.5–5 and ~2–20 nT for the short-period and long-period components, respectively. It is noted that the induced geomagnetic perturbations recorded by the observatories at significantly different distances from the source of the earthquake feature almost simultaneous and morphologically similar behavior.

Keywords:

earthquake geomagnetic field variations 

Notes

FUNDING

The studies were carried out under Program 19 of Basic Research “Fundamental problems of geological and geophysical study of lithospheric processes” of the Presidium of the Russian Academy of Sciences.

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Copyright information

© Pleiades Publishing, Ltd. 2019

Authors and Affiliations

  1. 1.Institute of Geosphere Dynamics, Russian Academy of SciencesMoscowRussia

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