From Youtube
Title: Best Video of Mount St Helens Volcano Eruption footage
https://www.youtube.com/watch?v=ZhvkITCGqK4
Published on Feb 20, 2015
May 18th 1980 Mount St Helens Volcano Eruption footage
The large eruption on Mount St Helens began at 8:32 am.
The earthquake shook loose the upper northern flank of the volcano. About 3.2 cubic km of of the mountain slid down in a massive avalanche at 250 km/h toward the base of Mount St Helens.
The avalanche released extreme pressure on the volcano which began a huge explosion. A 500 km/hr blast of hot gases and fractured rock covered 600 sq km in minutes. 30 seconds after the initial blast the Mount St Helens volcano released a Plinian eruption column of ash which rose to a height of 25 km in 15 minutes. The ash reaches Spokane 430 km away in 3½ hours. From noon until 5:30 pm a burning cloud swept 8 km down the northern slopes of the volcano at 300 km/hr. Mudflows raged down the side of the volcano and were caused by melting of the snow on the mountain. Hope you enjoyed this Mount St Helens video footage hd
Best Video of Mount St Helens Volcano Eruption footage HD
