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

1.5K reactions · 234 shares | PYROCLASTIC FLOW A pyroclastic flow is...

A pyroclastic flow, consisting of solidified lava pieces, volcanic ash, and hot gases, surged down Mount Etna in Sicily on Monday. The Italian National Institute of Geophysics and Volcanology released footage showing clouds of ash billowing from the volcano, filmed by a researcher during an expedition. (INGVvulcani via Storyful) | KTLA 5 News

36K views · 374 reactions | Caught on cam: Boaters flee volcanic ash cloud | CTV News | Facebook