Some 12 years ago, G.M. Wenz hypothesized, on the basis of scanty data, that the seismic unrest of ocean floor was possible cause of the low‐frequency noise background of the deep sea. In the present note this idea is reexamined quantitatively in the light of subsequent measurements with seismometers on the sea bed. It is found that the noise levels likely to result from sea‐bed motion of the sea are indeed comparable with those of shipping, and therefore, must be included in models to explain and predict the level of the ambient noise background of the sea.

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