Or, the snow slid off somebody's roof. :)
I hear ya! Sometimes that sounds and feels just like a quake. Same with the ridgepole popping when the house starts warming up. And speaking of snow sliding off roofs, we helped ours along and our roofs is finally almost bare. It's 32 degrees here! I even sat in the sun on our balcony for awhile today. Ahhhh, spring is truly here. :)