They’re all different. This is the biggest I’ve felt up here, and it lasted about a minute. Everything rattled and shock and you could hear lots of noises. We gave serious thought to getting out of the building as it went on and on. I’m more used to rollers, or one sharp, large thump.
We’ve in CA several times and never felt one. Our daughter lived there [west LA] for six months without feeling one. Closest thing I could think is a low level sonic boom. Went trough a lot of those in the 60s.