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And a large earthquake is almost never a good thing but when it happens one mile beneath a huge active volcano it can be the start of something that feels a little bit like the end of the world. when that earthquake happened a mile beneath mt. st. helen's 35 years ago today thus started a huge volcanic eruption in the continental united states. it blew more than 1300 feet off the top of that mountain in washington state. the whole northside of that mountain collapsed and quickly that collapse was the largest landslide in recorded history. rock and searing hot gases shot sideways out of the col...

On saturday morning, a massive chunk of a mountain collapsed and within seconds a wall of mud buried everything in it path. here are two 911 calls that have been released. >> we have a freaking mudslide. all i see is dirt. we watched hundreds of trees come falling out of -- i'm on sea post road highway 030. and there's not even a house here anymore. >> are there any injuries? >> yes. there's people yelling for help. >> my neighbor's house and their neighbor's house have been completely taken out. and it's collapsed on several of them. they're trapped. >> you know they'red inside th home still?...

What was in the air eventually subsided. it's what happened on the ground that even 35 years later they're still rfg to cope with the the largest landslide in history physically changed their world. when the top of that mountain blew off and the north side of that mountain collapsed the debris from that in less than ten minutes filled an adjacent river valley. 25 square miles of that river valley to an average depth of 150 feet in less than ten minutes. imagine taking this huge river valley filling it with degree the height of a 12 to 15-story building, and it all happens in less than ten minu...

Mountain into a crater. 35 years later it is still posing challenges. the "statele times" today does have one remarkable article. and it notes one bright spot, basically, in the mount st. helen's aftermath wh which about that little town of castle rock. the seattle times said the little town of castle rock decided what to do with some of that sand and ash that almost buryied them 35 years ago. volcanic sand is useful in playing fields and sand traps and. and now the city of castle rock is managing the sediment pile blue selling its volcanic sand. the town is earning some money thousands of dol...