Yellowstone National Park super-volcano over due for eruption.

Scientists are predicting that the world’s largest super-volcano in one of America‘s most popular national parks could erupt in the near future.Yellowstone National Park’s caldera has erupted three times in the last 2.1million years and researchers monitoring it say we could be in for another eruption.They said that the super-volcano underneath the Wyoming park has been rising at a record rate since 2004 – its floor has gone up three inches per year for the last three years alone. July 22, 1980: Mount St Helens in Washington erupts. A Yellowstone caldera eruption would explode with a force a thousand times more powerful

Yellowstone National Park super-volcano over due for eruption

It would explode with a force a thousand times more powerful than the Mount St Helens eruption in 1980.

America’s Ten Most Dangerous Volcanoes

2. Mount St. Helens Volcano, Washington

Photograph courtesy Robert Krimmel, USGS

The eruption of Mount St. Helens 30 years ago on May 18, 1980 (pictured),  is the most devastating and most studied volcanic explosion in U.S. history. The blast killed 57 people and spewed 520 million tons of volcanic ash, darkening the skies of Spokane, Washington, more than 250 miles (400 kilometers) away.

Over the last 10,000 years, Mount St. Helens has erupted more frequently than any other volcano in the Cascade Range, and has continued erupting, albeit gently, in recent years. (See “Mount St. Helens Blows Steam, Ash.”)

“Certainly it’s not possible to replicate the 1980 eruption, because the mountain isn’t there anymore—it collapsed,” said USGS Volcano Hazards Program coordinator Eichelberger.

“But there’s nothing to say that a new, very gas-rich batch of magma couldn’t come in under the thing and start a new explosive cycle

America's Ten Most Dangerous Volcanoes

America's Ten Most Dangerous Volcanoes. 2. Mount St. Helens Volcano, Washington

Spewing lava far into the sky, a cloud of plant-killing ash would fan out and dump a layer 10ft deep up to 1,000 miles away.

Two-thirds of the U.S. could become uninhabitable as toxic air sweeps through it, grounding thousands of flights and forcing millions to leave their homes.

But hampered by a lack of data they have stopped short of an all-out warning and they are unable to put a date on when the next disaster might take place.

When the eruption finally happens it will dwarf the effect of Iceland’s Eyjafjallajökull volcano, which erupted in April last year, causing travel chaos around the world.