Anomalous Increase in the foF2 Critical Frequency Prior
to the Spanish Earthquake of May 11, 2011

V. V. Hegai, A. D. Legen’ka, and V. P. Kim

Institute of Terrestrial Magnetism, Ionosphere, and Radiowave Propagation,
Russian Academy of Sciences, Troitsk, Moscow oblast, 142092 Russia

e-mail: hegai@izmiran.rssi.ru

Received July 25, 2012; in final form, October 17, 2012

Abstract—A study of variations in the critical frequency of the F2 layer (foF2) prior to a shallow-focus earth-
quake with a magnitude M = 5.1 which occurred in Spain on May 11, 2011, is carried out. The obtained results
show that a positive disturbance in the foF2 value was observed at the ionospheric Del’ebre station, which is
the closest to the earthquake epicenter. At the same time, no disturbances in foF2 are revealed at ionospheric
stations located at a greater distance from the epicenter. This fact makes it possible to conclude that the positive
disturbance in the F2 layer observed at the Del’ebre station could have a sesmogenic nature.

DOI: 10.1134/S0016793214010058

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