Not too make to fine a point of it but the really cool thing about low frequency seismic type vibrations, generated by the Earth crust and traffic mostly, is how super strong they are. 🏋🏻♂️ They can vibrate 700 lbs like it was a feather. People think they’re safe on concrete slabs, too. If mass was the answer LIGO would have built a massive stand for their electronics to detect gravity waves. But they didn’t. They built a spring isolation system. Just when you thought it was safe to go in the water. 🦈