Fig. 6From: Seismic signature detection during the 2018 Anak Krakatau flank collapse and tsunami using seismic amplitudes from regional-scale monitoringTime–frequency scanning of four tectonic earthquakes listed in Table 1. a EQ1, b EQ2, c EQ3, and d EQ4. Rectangles in \(C\) distribution plots show the examination windows for the analysis in Fig. 7. Seismograms from two stations are shown in the top panelsBack to article page