The Yellowstone volcano has erupted three times in history – 2.1 million years ago, 1.2 million years ago and 640,000 years ago. Experts have previously revealed that, should an earthquake occur, it could take less than two weeks before a catastrophic reaction is triggered. USGS Chief Seismologist Jamie Farrell revealed how experts at the US government agency were left biting their nails over a 6.1 magnitude earthquake.
He detailed how the natural phenomenon was the biggest he had ever seen in Yellowstone National Park.
He said in 2018: “We have had a couple of earthquakes in the Yellowstone area larger than magnitude 6.
“In 1975 we had a 6.1 near the Norris geyser area.
“It is the largest event that has happened inside the park and within the caldera.”
Mr Farrell went on to reveal how the event caused several landslides and threatened the safety of tourists.
He continued: “The effects were seen in the park, there was a lot of rockfalls that blocked the roads and changes to the hyper-thermal systems.
“There was significant damage to buildings and a number of landslides.”
It was revealed in 2015 how there is now an increased risk of a supervolcano erupting by the end of this century.
Dr Michio Kaku, renowned professor of physics at City College in New York, described the caldera below the park as a “sleeping Godzilla”.
He told Fox News in January: “Forget the image of Yogi Bear representing Yellowstone, we are talking about a sleeping Godzilla underneath Yellowstone.
“If it erupts in a maximum eruption of Category 8 it will literally tear the guts out of the US.
“Instead of having 50 states we would be left with 30.
“This report looked at a Category 7, which is more likely once every thousand years, rather than once every million years.
“That means in every century there is a 10 per cent chance that somewhere on the planet there could be a supervolcanic Category 7 eruption.”
However, Dr Kaku reminded viewers there would be plenty of time to evacuate.
He explained: “Category 7 will be many times the size of Mount St Helens, enough to cause widespread destruction across a state, but not enough to destroy the USA.
“But still, it’s something that we have to take very seriously now.
“Unlike a meteor from outer space, where you get no warning whatsoever, we get warnings.
“If you see movies like Pompeii, you know that there are days, in fact, weeks of eruptions building up, rumbling inside, underneath the pocket of lava.
“So there would be enough time, several weeks, to begin evacuations if and when such an unlikely event were to take place.”