Fig. 4From: Ionospheric response to the 2020 Samos earthquake and tsunamiΔTEC obtained from the band pass filter (a, b) and the VARION algorithm (c, d) using the GPS signals from the PRN 7 and 30 acquired by the GNSS receivers shown in Fig. 2. Panels e, f show the IPPs location for PRN 7 and 30 (respectively) in which the colour bar represents the time (in minutes) after the earthquakeBack to article page