I would like to see observation and studies backing up this oft-cited
observation, since it would seem to contradict various footage from SE
Asia.
There are three reasonable sources that describe, illustrate, and
explain the phenomena.
Geophysics; Washington University (look for "tsunami")
Pacific Tsunami Research (geophysics) (can't recall the exact
locality but it's on Hawaii)
NASA (yep, space guys look at the ocean too)