Microbaroms

Like their seismic equivalent, microseisms, microbaroms are believed to be generated by speaker-like vertical ocean displacement induced by nonlinear interactions between trains of waves traveling in nearly opposite directions with similar frequencies. While microseisms are generated by energy traveling vertically down through the water column, microbaroms are the part of the sound field that travels through the atmosphere near the horizontal. Microbaroms make up the bulk of the acoustic energy present in the 0.2-0.5 Hz frequency band, and thus act as a significant source of noise in the band used for nuclear treaty monitoring.