Infragravity waves are generated in the nearshore region and are observed
at KEBB only after they propagate from the shelf into deeper water and
pass over KEBB.
This agrees with the previous analysis of the MOBB data
which also showed that the infragravity waves
are generated in the nearshore region (Dolenc et al., 2005).
It sheds some light on the generation of the earth's low frequency "hum"
, confirming that coupling of infragravity
waves with the solid earth occurs close to the shore (Rhie and
The long-period noise due to infragravity waves is
unavoidable in shallow ocean
bottom installations and postprocessing is needed to remove it from
the seismic observations (Dolenc et al., 2007a).