Unique variations of the total electron content in the preparation period of Haitian earthquake (M7.9) on January 12, 2010 |
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| Authors: | S A Pulinets K G Tsybulya |
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| Institution: | 1.Institute of Applied Geophysics,Moscow,Russia;2.Institute for Space Research,Russian Academy of Sciences,Moscow,Russia |
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| Abstract: | Variations of the total electron content according to the index IONEX IGS in the period of preparation of the earthquake in
Haiti (M7.9) on January 12, 2010, are considered. The situation is exceptional owing to the unique position of the island
of Haiti relative to the structure of the ionosphere over the Caribbean Sea: the ionospheric region over Haiti is in the trough
formed by the northern slope of the equatorial anomaly and additional maximum formed at latitudes of approximately 30° N within
this longitudinal interval. Distortion of the shape of the equatorial anomaly, total decrease in the electron content in the
equatorial anomaly a few days prior to the earthquake, increase in the electron concentration directly over the earthquake
epicenter a few days prior to the earthquake, increase in the additional maximum at latitudes of ∼30° N, and formation of
an additional maximum in the Southern Hemisphere in the region conjugated to the additional maximum in the Northern Hemisphere
in the periods of its intensification are observed. The configuration of the equatorial anomaly is restored after the earthquake. |
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