Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2016, Vol. 13, No. 1, pp. 186-196
Studying far-field propagation of ionospheric disturbances generated by the Tohoku earthquake
N.P. Perevalova
1 , N.V. Shestakov
2, 3 , S.V. Voeykov
1 , V.G. Bykov
4 , M.D. Gerasimenko
3 , P.H. Park
5 1 Institute of Solar-Terrestrial Physics SB RAS, Irkutsk, Russia
2 Far Eastern Federal University, Vladivostok, Russia
3 Institute of Applied Mathematics FEB RAS
4 Institute of Tectonics and Geophysics FEB RAS, Khabarovsk, Russia
5 Korea Astronomy & Space Science Institute, Daejeon, South Korea
Accepted: 06.10.2015
DOI: 10.21046/2070-7401-2016-13-1-186-196
The paper presents results of the study of far-field propagation of the main types of traveling ionospheric disturbances (TIDs) caused by the March 11, 2011, Japan earthquake. The study relies on double frequency phase data acquired by several GPS networks operating in the Asia-Pacific region: the FEB RAS complex geodynamic network, the GS RAS Kuril network, the Southern Korean network, the international IGS network (http://sopac.ucsd.edu), and the GEONET networks in Japan (http://mekira.gsi.go.jp). We have determined the direction and distance of propagation for various TID types and have revealed TID attenuation asymmetry in different directions from the epicenter: the TIDs are registered up to 2000–2200 km from the epicenter northwestward, but they fade at a distance of 1300 km northeastward. The TIDs damp rapidly in the azimuth sector of 10–45º from the epicenter (at ~800 km). Fast TIDs (V~2000–3000 m/s) effectively propagate southwestward from the epicenter; they are less pronounced northwestward and are absent northeastward. The TIDs caused by acoustic waves (V~600–1000 m/s) are propagating symmetrically in all directions, but almost disappear at 800–1500 km from the epicenter. Only this type of TIDs is observed northeastward. Slow TIDs (V~150–300 m/s) move largely southwestward and northwestward.
Keywords: GPS-TEC, traveling ionospheric disturbances, Tohoku earthquake
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