
© AMAZONMt St Helens is rising at 5m a day.
Mount St Helens could erupt again as scientists closely monitor a lava dome rising at five metres a day, a bombshell documentary revealed.
On May 18, 1980, Mount St Helens erupted in the US state of Washington. The blast, which measured 5 on the Volcanic Explosively Index, has been declared as the most disastrous volcanic eruption in modern US history. An huge column rose 80,000 feet into the atmosphere and deposited ash in 11 states, killing at least 57 people and causing more than $1billion (£770million) in damage.
Scientists are now closely watching the volcano to make sure they are prepared in case the same happens again.
Amazon Prime's "Mega Disaster:
It's Happened Before, It Will Happen Again" series revealed how a team of volcanists monitor the ticking time bomb.
Rick LaHusen, from the United States Geological Survey (USGS), detailed how they use an instrument known as the "Spider" to keep an eye on volcanic activity.
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