[mucsun]

Never heard of this either, but I don't agree with your theory, as waves usually form only superficial on the ocean.

[hugey010]

This is an unusual measurement which is unexplained by current models. This chart [0] helps show why and when waves are not superficial to only surface of the ocean.

[0] https://en.wikipedia.org/wiki/Microseism#/media/File:Interfe...