This will sound like a bunch of bs but I was sitting in a deer stand at the time this happened. I was watching behind me and I noticed some small saplings shaking. I looked and could not see anything(squirrels, wind or myself) that would be causing them them to shake. Then on my drive home I heard about the quake and started thinking thats probably what was making those trees shake. Don't know for sure but I have hunted this particular stand several times over the last 4 years and have never seen anything like it.