Figure 2
From: Tsunami detection by GPS-derived ionospheric total electron content
Tide-gauge locations along the Chilean coastal region (left panel). The tsunami waveform for the Pisagua and Illapel earthquakes are shown in central panel. The data were filtered using a zero-phase digital high-pass filter to eliminate signals over 180 min period. The dotted lines show the first arrival of tsunamis to the tide-gauge sites. Tsunami spectra of 24 h of elapsed time are shown in right panel.
