On Tue, 25 Feb 2014 10:08:58 -0500, Rebel1
wrote:

Any other theories as to why the house may have been vibrating,
especially for hours?

Sea Legs are Illusions of self-motion (*).

"Neural adaptation or sensory adaptation is a change over time in the
responsiveness of the sensory system to a constant stimulus. It is
usually experienced as a change in the stimulus." (**)

* http://en.wikipedia.org/wiki/Illusions_of_self-motion

** http://en.wikipedia.org/wiki/Aftereffect

After train rides I could still hear / feel the clacking of the tracks
for awhile. Same on long road trips where you might hear the sounds of
thumping when tires cross sections of the pavement.