I'm gonna say that is was probably Natural or extra terrestrial. The Earth produces more energy than can be produced by human action at a single instant. The ring of fire has a HUGE amount of energy to make it what it is. Compare the effects of the damage of the B-83 nuke to an earthquake. If all of the energy of a 9.0 magnitude quake where placed within the radius of the fire ball of a B-83 then (I haven't done the calculation) shit would be shook to dust.
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