You probably heard about the earthquake that hit Virginia. Well, being in Virginia, not terribly close to the quake center, but close enough to feel it significantly, Wally went crazy when it started.
He didn't want to walk at all, even after it was over. He was scared it would start moving again. Fortunately, he was able to calm down about a couple hours later.
While it was going on, I took his mind off what was happening as best as possible (not easy with house rattling and ground shaking). We played some games, tried to get him into his catching, which worked a bit. We also did some simple training, just anything to get him to think about something else but the quake as much as possible.
Then the aftershocks. While they aren't much to worry over for us humans, he's still looking at the ground when it happens. (One just happened as I'm writing this, but luckily, he's sleep and it was quick so he may not have felt it). They don't worry him as much, but they catch him off guard.
Wally certainly does not like the ground under him moving. I don't even like to move a rug while he's on it, or his bed while he's on it. That might just be a dog thing in general, not liking their feet moving or the ground under them moving - it might be something all us land-based creatures don't like.
For what it's worth, the fish in house didn't really care about the whole thing.