PEPCON Corp, Henderson, Nev. July 1988. That explosion registered a 3.5 on the Richter scale at a California observing station.
Ammonion Perchlorate in the estimated amount of 8.5 million lbs went up in smoke in several explosions. The one pictured was the grand finale and pretty much flattened Henderson, Nev.
The white building to left of the blast was a marshmellow factory.
The video was filmed from 4 miles distant.
There were only 2 fatalities.