Winter in Sutton means snow (and sleet, freezing rain, graupel, etc). The garage where my RSB lives near the back wall is a two story barn-like gambrel. It has a metal roof and sometimes snow slides off.
In this event sliding snow removes weight from the roof with a gentle whoosh of sound. It takes about 0.8 seconds to fall and appears to displace some air pushing some toward the garage wall. When it hits the ground, kinetic energy splashes around and generates the strongest signals.
The garage seems to have two fundamental frequencies. The first may be what the garage “rings” at, the second may be how the ground and floor respond.