Figure 3
From: Tsunami detection by GPS-derived ionospheric total electron content
Imaginary sky view of the GPS satellites from the 2014 Pisagua earthquake (A) and Pisagua earthquake (B) epicenters. The blue circle represents the 20° elevation, which was used as criteria for the utilization of the GPS satellite data. The residual VTEC is presented for PRNs 01, 11, 20, and 23 during the 2014 Pisagua earthquake (A) and for PRNs 2, 12, 24, and 25 during the 2015 Illapel earthquake (B). The dotted lines mark the time of the earthquakes. The colored lines represent the residual VTEC regarding the locations of GPS latitudinally from north to south. The red stars indicate the latitude of the earthquake epicenters.
