That creates a problem for the airburst theory. Small asteroids, like the one over Chelyabinsk, make small blast and break windows. Big asteroids that would cau

That creates a problem for the airburst theory. Small asteroids, like the one over Chelyabinsk, make small blast and break windows. Big asteroids that would cause lots of damage reach the ground. It is possible to have one that explodes right above the ground and makes nuclear bomb sized explosion but probably not that much pressure. The other problem is the likelihood of this happening. Above talks about 50 strikes which coincidentally stopped with better records. There should have been more destruction in last few centuries.