About 150, 000 years ago, the volcano's southeastern flank collapsed and generated a debris avalanche that reached as far as from the summit.
32.
In many of the 120 new ponds created in the debris avalanche and in Spirit Lake, the northwestern salamander has taken up residence.
33.
It is a very explosive andesite volcano that underwent edifice collapse in the late Pleistocene, producing a volcanic debris avalanche that reached the lake.
34.
On February 17, 2006, a massive rock slide-debris avalanche occurred in the Philippine province of Southern Leyte, causing widespread damage and loss of life.
35.
A massive debris avalanche triggered by an earthquake measuring 5.1 on the Richter scale caused an eruption The debris avalanche was up to in volume.
36.
An eruption in 1772 caused the northeast flank to collapse producing a catastrophic debris avalanche that destroyed 40 villages and killed nearly 3, 000 people.
37.
A massive debris avalanche triggered by an earthquake measuring 5.1 on the Richter scale caused an eruption The debris avalanche was up to in volume.
38.
Some of the worst mudslides occurred in the Mount Hood Corridor, and one man died in a mud and debris avalanche near John Day bridge collapsed.
39.
The bottom layer of a debris avalanche deposit is the fine-grained matrix which forms due to the shear at the base of the large, turbulent moving mass.
40.
The eruption caused a massive debris avalanche, reducing the elevation of the mountain's summit from, and replacing it with a mile-wide ( 1?km ) horseshoe-shaped crater.
