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ISSN 2070-7401 (Print), ISSN 2411-0280 (Online)
Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa
CURRENT PROBLEMS IN REMOTE SENSING OF THE EARTH FROM SPACE

  

Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2012, Vol. 9, No. 3, pp. 172-180

Investigation into ionospheric disturbances caused by the earthquake of 11 March 2011 in Japan, using GEONET data

N.P. Perevalova 1, S.V. Voeykov 1, Yu.V. Yasyukevich 2, A.B. Ishin 1, E.S. Voeykova 3, V.A. Sankov 4
1 Institute of Solar-Terrestrial Physics of the Siberian Branch of the Russian Academy of Sciences, 664033, Irkutsk, Lermontova, 126a
2 Institute of Solar-Terrestrial Physics of the Siberian Branch of the Russian Academy of Sciences Irkutsk State University, 664033, Irkutsk, Lermontova, 126a 664003, Irkutsk, Blvd. Gagarina, 20
3 Irkutsk State University, 664003, Irkutsk, Blvd. Gagarina, 20
4 Institute of the Earth's Crust of the Siberian Branch of the Russian Academy of Sciences, 664033, Irkutsk, Lermontova, 128
Disturbances of the total electron content (TEC) accompanying the powerful earthquake of 11 March 2011 in Japan were examined using GPS-data from the dense GPS network GEONET. We constructed and analyzed two-dimensional spatial patterns of TEC disturbances, maps of the velocity field of ionospheric disturbances, and time-distance diagrams. They reflect evolution of the ionospheric response to seismic effect. The analysis of TEC spatial patterns allowed us to reveal traveling ionospheric disturbances (TIDs) of two types whose form was close to the annular waves propagating from the epicenter. Large-scale TIDs were recorded at 05:50-06:25 UT; their wavelength was about 600 km, and their average propagation velocity was about 724 m/s. Medium-scale TIDs were observed later (after 06:25 UT); their wavelength was about 200 km, whereas the average horizontal velocity of their propagation (359 m/s) was much less than that of large-scale waves. Time-distance diagrams indicated some TID modes traveling at different speeds (from 159 to 2.6 km/s). Velocities of modes are fairly close in various directions from the epicenter, whereas the amplitude of TEC disturbances depends on the direction of their propagation
Keywords: ionospheric disturbances, TEC, GPS, earthquakes
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