this weekend i was at my friends house, we sat on the porch admiring the rain and drinking wine and we started hearing subtle shaking booming sounds, not thunder at all. we couldnt tell where it was coming from, sometimes we would feel it vibrate underneath us, other times we could feel it vibrating downward from the sky. this went on every few minutes for about an hour. we just sat staring wide eyed at each other saying, "did you hear that one?" and "i just heard it again!"

Im in LA btw