How do dogs sense earthquakes?

I have been in several earthquakes and they are rarely, in my experience, sudden jolts of movement going from totally still to totally shaking.Every quake I have experienced has been a build up of motion to full magnitude then a drop off followed by after shocks.It's plausible that the dogs can hear something, but I suspect that if you are on all fours with no shoes on (or in the case of the video, actually laying down on the floor) you are going to sense the minor start of the movement before people who are standing up.Notice also that the fat guy starts running for the door before anything on screen starts shaking.Edited by Nuggin, : No reason given.

I've got two dogs which don't seem to notice quakes even as they are happening

I rewatched the video again.The dog freaks at about second 4. The man in the chair (can't see him, but can see the chair) gets up at second 5 and everything really starts to move around second 7.Given that, it doesn't seem like this dog is anything more than a second to a second and a half ahead of the guy sitting in the chair on rollers.Now, this is a big quake, but I can tell you, I've been through tiny ones in a chair and didn't even notice because I wasn't touching the floor.In all likelihood this is just an animal lying down, freaking out and reacting faster than the guy who isn't touching the floor at all.Not really anything to get excited about