According to monitoring services from the United States Geological Survey (USGS), 73 earthquakes have hit Yellowstone in the past 28 days. This equates to almost three earthquakes a day on average, with the strongest registering as a magnitude 2.8 on June 14. However, some experts warn it is not necessarily the size of an earthquake which is the indication of an upcoming volcanic eruption, but more 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.”
Yellowstone’s National Park Service said that the region usually has about 700 earthquakes a year.
On the upper scale, Yellowstone can experience up to 3,000 quakes in a year.
The USGS says: “Almost all earthquakes at Yellowstone are brittle-failure events caused when rocks break due to crustal stresses.
“Though we’ve been looking at Yellowstone for years, no one has yet identified ‘long-period (LP) events’ commonly attributed to magma movement.
“If LP events are observed, that will NOT mean Yellowstone is getting ready to erupt. LP earthquakes commonly occur at other volcanoes in the world, including volcanoes in California, that have not erupted for centuries or millennia.”
The Yellowstone supervolcano, located in the US state of Wyoming, last erupted on a major scale 640,000 years ago.
According to the USGS, the chances of a Yellowstone eruption is around one-in-730,000.
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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.
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By drilling 10 kilometres into Yellowstone, the NASA employee believes that 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 that the plan could cost $3.5bn (£2.9bn) and would have the added benefit of using the steam from the water and magma combo to create carbon-free geothermal electricity at a much cheaper rate than any alternative energy currently available on the market.
Mr Wilcox told Mr Walsh: “The thing that makes Yellowstone a force of nature is that it stores up heat for hundreds of thousands of years before it all goes kablooey all at once. It would be good if we drained away that heat before it could do a lot of damage.”
Others, however, are not so convinced about the feasibility of Mr Wilcox’s idea.
USGS scientist Jake Lowenstern told Mr Walsh: “It all seems a bit fanciful.”