Fig. 3
From: Fin whale song recordings by onshore seismometers open new horizons for cetacean coastal monitoring
Fin whale note recorded on Ocean Bottom Seismometer ORK07. Top panels in subfigures show spectrograms and bottom panels show time series bandpass filtered between 15 and 30Hz. (a) Hydrophone channel HDH. (b) Vertical seismic component HHZ. (c, d) Horizontal seismic channels HH1 and HH2 respectively. A 112-point fast Fourier transform (FFT) with a Hanning window and 99% overlap was used to create the spectrograms.
