Pyroclastic flows from Unzen were generated by gravitational collapse of the growing lava dome, near the city of Shimabara, Nagasaki (1991). Most of the flows traveled from 1 to 3 km, but some flows reached more than 4 km, burning houses and killing people in the evacuated zone of Kita-kamikoba on the eastern foot of the volcano.The velocities of the flows ranged from 15 to 25 m/s on the gentle middle flank. Scientific paper: http://link.springer.com/article/10.1007/BF00301514#page-1 Other detai

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Insane Pyroclastic flow from the Large Volcanic eruption in Guatemala. Pyroclastic flows can reach speeds of 450mph, and incenerate what they pass over, with temperatures of 1,200 - 1,400 degrees! This looks like something out of a movie right now. We sometimes overlook volcanoes and how powerful they can be. Let's not forget the men and women of Guatemala during this time. Prayers for all. _____________ Video credit: twitter/emanueloficial "Emmanuel") | Collin Myers