I felt that (I live on Long Island).
I thought it was construction vehicles. We've had a lot of heavy construction around here.
What made it clear it was different, was my cat didn't like it, and he ignores the construction.
I thought it was construction vehicles. We've had a lot of heavy construction around here.
What made it clear it was different, was my cat didn't like it, and he ignores the construction.
https://www.youtube.com/watch?v=VJ-p9qOhBv4
...again. This is a Cat Cafe in Japan, and you can clearly see the cats get alerted to something ~10 seconds before the shaking starts. Do we have an idea of what they are reacting to?
He was sitting on my lap, at the time. I'm glad he didn't extend his claws.
I suspect some kind of subsonics that come before the shaking really gets going. It can take a bit of time to get a rhythm going, so the earthquake may actually be under way for a bit, before we really feel it.