Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2016, Vol. 13, No. 5, pp. 251-261
GPS-detection of ionospheric effects of earthquakes in dual-frequency and single-frequency modes
O.A. Gorbachev
1 , V.B. Ivanov
2 , A.A. Kholmogorov
2 1 Irkutsk Branch of Moscow State Technical University of Civil Aviation, Irkutsk, Russia
2 Irkutsk State University, Irkutsk, Russia
Accepted: 30.07.2016
DOI: 10.21046/2070-7401-2016-13-5-251-261
The aim is to study the possibilities to investigate irregular variations of the total electron content (TEC) of the ionosphere by using dual-frequency and single-frequency measurements in the GPS system. As an example, the time variation of inclined TEC was analyzed during powerful earthquakes in Japan on 11 March 2011 and in Chile on 27 February 2010. The initial data are dual-frequency and single-frequency code and phase measurements at the stations of IGS international network. As a result, the reaction of the ionosphere in the form of quasi-periodic perturbations of the regular time variation was confirmed by comparing the time variations of the TEC during the earthquake with the control days. Also, a qualitatively different response of the ionosphere in the form of inflection on the time variation of the TEC was observed. This type of reaction of the ionosphere was detected during both earthquakes investigated. From the data obtained, the speed of propagation of disturbances forming the primary response of the ionosphere to the earthquake was estimated by fixing the inflection points. Single frequency and dual frequency modes showed qualitatively and quantitatively identical results. This feature allows evaluating various options of the earthquake in single-frequency mode
Keywords: GPS, ionosphere, single-frequency measurement, earthquakes, TEC
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