Yellowstone Supervolcano is two and half times bigger than earlier estimates and covers over 1000 square miles

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

The team found that the magma chamber was colossal. Reaching depths of between 2km and 15km (1 to 9 miles), the cavern was about 90km (55 miles) long and 30km (20 miles) wide.

It pushed further into the north east of the park than other studies had previously shown, holding a mixture of solid and molten rock.

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