I've seen shock waves that big from a 2000-pound TNT equivalent bomb - impressive but not really that big when you consider the amount of energy that a volcano is capable of producing.

Car bomb shock wave - probably way less than 2000-pound but good comparison to this video: https://www.youtube.com/watch?v=NN05jCosAe8

I've seen shock waves that big from a 2000-pound TNT equivalent bomb - impressive but not really that big when you consider the amount of energy that a volcano is capable of producing.