How do I detect how many collisions are happening in game (for all objects in a scene?)

I'm working on making a destruction game and I want a sort of "destruction meter" based on how many objects are colliding and at what velocities. I know how to get collisions between one object and other objects but is there a way to determine how many collisions are happening in the scene at the same time? T$$anonymous$$s would help me a ton and open the door to adding some neat procedural sound effects.