Figure 2
From: Boat noise impacts risk assessment in a coral reef fish but effects depend on engine type
Representative spectrograms of individual motorboat passes for (a) 2-stroke and (b) 4-stroke engines in the pressure domain; and the same (c) 2-stroke and (d) 4-stroke passes recorded as monoaxial particle acceleration. Fast-Fourier Transformation = sampling rate (44100 Hz), Hamming window, 0–2000 Hz.
