Analysis of ionospheric parameters above active seismic regions

Abstract

The aim of this paper is to examine the anomalous variations of the critical frequency (f0 F2), total electron content (TEC), and f0 Es parameters before earthquake occurred on 1 April 2014 near Iquique Chile (M=8.2) and event on 25 October 2013 in Japan (M=7.1). Using the bound method we analyzed the variations of f0 F2, TEC, f0 Es and Nm F2 parameters. The anomalous variations in f0 F2, TEC, f0 Es and Nm F2 parameters observed 1 day, 15 days, 4 days and 1 day prior to Chile event and anomalous variations in f0F2, TEC and f0Es observed 3 days, 3 days and 2 days prior to earthquake event of Japan.