It doesn’t.
A shockwave isn’t sound past a certain volume, it’s a pressure wave caused by extreme changes in pressure over a short period of time.
If you detonate a stick of dynamite, it releases gas at an insanely fast rate with deadly force. That blast of pressure radiates outward damaging/destroying things in the near vicinity. The pressure travels through the air, which we hear as the sound of that force.
Contrast that with tapping a coin on a desk. You’re also creating pressure but not a lot – and yet the sound of impact can be quite loud without any dangerous pressure being created.
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