Fig. 4From: Seismic signature detection during the 2018 Anak Krakatau flank collapse and tsunami using seismic amplitudes from regional-scale monitoringTime–frequency scanning of signals during the 2018 Anak Krakatau flank collapse and tsunami episode. a Seismogram at CGJI station. The scanning is performed using stations with epicentral distances of b < 400 km and c < 200 km from the volcanoBack to article page