USA, Wyoming, Montana, Idaho:

Yellowstone Supervolcano 'Even More Colossal' (BBC News)

An erupting Yellowstone volcano would have
serious consequences for the USA (Courtesy BBC News)

The supervolcano that lies beneath Yellowstone National Park in the US is far larger than was previously thought, scientists report.

A study shows that the magma chamber is about 2.5 times bigger than earlier estimates suggested.

A team found the cavern stretches for more than 90km (55 miles) and contains 200-600 cubic km of molten rock reaching depths of between 2km and 15km (1 to 9 miles).

The findings are being presented at the American Geophysical Union Fall Meeting in San Francisco.

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