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GEOMAGNETIC ANOMALIES ASSOCIATED WITH EARTHQUAKES
Abstract
The purpose of the present study is to examine the geomagnetic anomalies possibly linked with seismic activity. We analyzed the geomagnetic data recorded at the Mikhnevo Geophysical Observatory (54.959?N, 37.766?E) and INTERMAGNET Magnetic Observatories in order to discover anomalous geomagnetic variations associated with the high-magnitude earthquakes. The magnetic field variations were analyzed during seismic events that occurred in different regions with a magnitude greater than ~ 5. It was established that at the final stage of the preparation of the focus and with the main shock, magnetic field perturbations are recorded. At the same time, geomagnetic variations are manifested in two forms: short-period, occurring within 5 ? 15 min after the main shock and long-period, the beginning of which is recorded either immediately after the short-period, or 5 ? 20 min before the main shock. For shallow focus earthquakes we observed both short-period (period of ~ 0.5 ? 0.8 min) and long-period (period of ~ 5 ? 20 min) geomagnetic disturbances. The maximum geomagnetic anomaly amplitude is 1.5 ? 2 nT for short-period variations and 2 ? 4 nT for long-period variations. For deep focus earthquakes we observed only long-period geomagnetic disturbances. Observations of the local variations in the geomagnetic field have afforded us some evidence that the observed geomagnetic anomalies are linked with the high-magnitude seismic events.
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Takla E.M., Yumoto K., Sutcliffe P.R., Nikiforov V.M., Marshalle R., Possible association between anomalous geomagnetic variations and the Molise Earthquakes at Central Italy during 2002, Physics of the Earth and Planetary Interiors, vol. 185, pp. 29-35, 2011.
Sobisevich A.L., Sobisevich L.E., Kanonidi K.K., Likhodeev D.V., Gravimagnetic perturbations preceding earthquakes, Dokl. Earth Sci., vol. 475, no. 2, pp. 891-894, 2017.
Yao X., Feng Z., Teng Y., Wang Y., Zheng Q., Geomagnetic variations associated with strong earthquakes in Yunnan area, Open Journal of Earthquake Research, vol. 6, pp. 228-237, 2017.
Krolevets A.N., Sheremet’eva O.V. A possible mechanism of magnetic variations, Volcanology Seismology, vol. 4, pp. 16-21, 2004.
Hattori K., ULF geomagnetic changes associated with large earthquakes, Terrestrial, Atmospheric and Oceanic Sciences, vol. 15, pp. 329-360, 2004.
Takla E.M., Yumoto K., Okano S., Uozumi T., Abe S., The signature of the 2011 Tohoku mega earthquake on the geomagnetic field measurements in Japan, NRIAG Journal of Astronomy and Geophysics, vol. 2, pp. 185-95, 2013.
Cicerone R.D., Ebel J.E., Britton J., A systematic compilation of earthquake precursors, Tectonophysics, vol. 476, no. 3-4, pp. 371-396, 2009.
Chen C.-H., Liu J.-Y., Lin P.-Y., Yen H.-Y., Hattori K., Liang W.-T., Chen Y.-I., Yeh Y.-H., Zeng X., Pre-seismic geomagnetic anomaly and earthquake location, Tectonophysics, vol. 489, no. 1, pp. 240-247, 2010.
Sobolev G.A., Ponomarev A.V., Physics of earthquakes and precursors. Nauka, Moscow, 2003.
Shalimov S.L., Atmospheric waves in the plasma of the ionosphere (with geophysical examples). Moscow, IFZ RAS, 2018.
Imtiaz N., Marchand R. Modeling of ionospheric magnetic field perturbations induced by earthquakes, Journal of Geophysical Research, vol. 117, A04320, 2012.
Riabova S.A., Spivak A.A. Geomagnetic variation peculiarities at middle latitudes of the East European Platform, Geomagnetism and Aeronomy, vol. 57, no. 2, pp. 199-206, 2017.
https://www.emsc-csem.org/ European-Mediterranean Seismological Centre
Riabova S.A. Geomagnetic effect of the strong 2011 Tohoku earthquake, Mining informational and analytical bulletin, no. 4, pp.137-151, 2019.
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