Changes in the ionosphere prior to weak earthquakes in the Irkutsk region


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Abstract

Data from 15-minute measurements at the vertical ionospheric sounding station in Irkutsk during the summer months of 2008–2011 are analyzed in order to detect in the ionosphere effects of preparation of weak earthquakes of the K = 10–12 energy class. The method of revealing disturbances in ionospheric parameters by simultaneous observations of the sporadic E layer and regular F2 layer, which was previously applied by the authors in the case of stronger earthquakes, was used. The efficiency of using this method to detect ionospheric disturbances preceding earthquakes also in the case of weak earthquakes is demonstrated. Possible ionospheric precursors of the selected series of earthquakes are identified. For them, an empirical dependence relating the time of advance of the shock moment by the probable ionospheric precursor on the energy class of the earthquake and the epicenter distance to the observation point is found.

About the authors

L. P. Korsunova

Institute of Terrestrial Magnetism, the Ionosphere, and Radio-Wave Propagation

Author for correspondence.
Email: lpcors@rambler.ru
Russian Federation, Troitsk, Moscow oblast, 142092

L. V. Chistuakova

Institute of Solar–Terrestrial Physics, Siberian Branch

Email: lpcors@rambler.ru
Russian Federation, ul. Lermontova 126a, Irkutsk, 664033

V. V. Khegai

Institute of Terrestrial Magnetism, the Ionosphere, and Radio-Wave Propagation

Email: lpcors@rambler.ru
Russian Federation, Troitsk, Moscow oblast, 142092

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