Monitoring services from the US Geological Survey (USGS) found there have been 113 earthquakes in the Yellowstone National Park in the past 28 days. The tremors were relatively small, with the largest being a 2.9 magnitude tremor on March 31. However, some experts warn it is not necessarily the size of an earthquake which is an indicator a volcano might erupt, but the quantity of them.
Portland State University Geology Professor Emeritus Scott Burns said: “If you get swarms under a working volcano, the working hypothesis is that magma is moving up underneath there.”
But others disagree about whether an earthquake swarm near a volcano could be a sign of things to come.
Jamie Farrell at the University of Utah in Salt Lake City believes this is just part of the natural cycle for Yellowstone volcano, saying: “Earthquake swarms are fairly common in Yellowstone.
“There is no indication that this swarm is related to magma moving through the shallow crust.”
The Yellowstone supervolcano, located in the US state of Wyoming, last erupted on a major scale 640,000 years ago.
According to the United States Geological Survey (USGS), the chances of a Yellowstone eruption is around one-in-730,000.
With 640,000 years having passed since the last major eruption, Yellowstone is edging closer to exploding – but it could still be thousands of years away.
However, experts are preparing for the worst now and are studying how a major eruption, which could instantly wipe out large swathes of the US, could be prevented.
One NASA employee believes he has found a unique way to stop a major eruption – by feeding cold water into Yellowstone’s magma chambers.
NASA engineer Brian Wilcox hopes to stave off the threat of a super-eruption is to cool down the magma in the chambers inside the volcano.
Around 60 to 70 percent of the heat generated by Yellowstone seeps into the atmosphere but the remainder builds up inside. If enough builds up, it can trigger an eruption.
By drilling 10 kilometres into Yellowstone, the NASA employee believes it would be possible to pump high-pressure water which will allow the cool liquid to absorb some of the heat before it is pumped out again.
Mr Wilcox told journalist Bryan Walsh in the latter’s new book End Times the plan could cost $ 3.5bn (£2.9bn).