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Fig. 4 | Progress in Earth and Planetary Science

Fig. 4

From: River discharge prediction for ungauged mountainous river basins during heavy rain events based on seismic noise data

Fig. 4

Spectrograms of seismic noise recorded at the N.FGTH station for the event of September 2015. a Running spectra of the raw seismogram. b Spectra at the three time periods shown in (a), where black, blue, and red spectrum are obtained in the daytime, midnight, and peak streamflow periods, respectively. c Running spectra of the seismogram after “clipping” transient peaks (e.g., earthquakes). d Spectra at the three time periods shown in (c). The gray dashed lines in each panel represent the spectral window used for our analysis (1–2 Hz)

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