[GSlob]

What are the frequency boundaries for animals' perception? Dogs and cats could hear near ultrasound, something to 30KHz, but here one is talking deep infrasound, probably below 1 Hz. If anything, deaf humans could have their hearing shifted somewhat toward low frequencies.

[c-five]

More likely, I speculate, animals may have felt the seismic ground wave, or noises made locally by its passing. Cats, for instance, have a superb sense of balance, so I think they should be able to detect very subtle movements.

Humans have become terrible listeners since they stopped being hunters and gatherers. Just ask your friends ;-)