Wow. That's amazing to see and hear. I especially liked hearing the shockwave rip past the cameraman. Very cool, OP.
So they knew the volcano was going to erupt and they intentionally got close to record it? Cray. I assume they weren't like National Geographic professionals.
We blew up 7000 lbs of old ordinance in the desert once in Afghanistan. I was volunteered for providing a cordon and to keep the Afghans from stealing the goods. We went about maybe half a mile (ish), and when it blew, a long time after the shock knocked my camera out of my hands. Was not expecting that. Wish I still had the video.