The volcano has caused scientists concerns for many years after a series of earthquakes in the 1980's triggered fears that the behemoth would erupt, leaving little time or options for those in the region

Scientists one of the US's largest supervolcanoes in California may be about to erupt after lying dormant for hundreds of thousands of years.

At a sprawling 20 miles long, 11 miles wide and 3,000 feet deep the Long Valley Caldera, California, has struck fear into researchers for years. Due to its enormity, it is classed as one of the world's 20 known super volcanoes, with a classification of VEI 8 on the eruption scale.