And to make the situation even more terrifying, there has been 11 earthquakes in the region since the geysers blew – more evidence of the subsurface action in the magma pits.
Below the surface of the park lies the fearsome Yellowstone Caldera, a super volcano which last erupted approximately 630,000 years ago.
Mr Grand and Mr Nelson say they found a “long, thin, sloping zone” inside the mantle of where the seismic waves were traveling slower than areas around them.
In their paper, published in the journal Nature Geoscience, they say the mantle is approximately 600 to 800C degrees, which is warmer than any other area.
But the pair suggested more research is needed because there are still outstanding questions about how Yellowstone exists in its current location.
The largest earthquake to ever strike the park was a magnitude-7.3 quake in 1959, which is known as the Hebgen Lake earthquake.
The Yellowstone Caldera supervolcano last erupted 700,000 years ago but experts say it should blow every one million years or so.