I also think that our type of ground might have kept it to a minimum, too. We have caliche about 6 inches under the topsoil [if you want to call it that LOL] and it’s harder than cement. Probably doesn’t vibrate like some other types of geological formations do.
That could have helped. I don’t know enough about that sort of thing.
I just know that I love rock ‘n’ roll but NOT when the ground is doing it. LOL