Although it is not yet clear when the volcano could erupt, the scientist has said it could happen soon. The Yellowstone Caldera which is a massive 34 to 45 miles wide, is a supervolcano located in the Yellowstone National Park.
The volcano last erupted 640,000 years ago which has led many scientists to believe that the monster volcano is due a mighty eruption any day now.
Scientists have also said that each time the supervolcano erupts, it causes dramatic changes to its surroundings.
Geological data suggests that the last major eruptions took place 2.1 million, 1.3 million and 640,000 years ago.
Its most recent eruption is believed to have created the main Yellowstone Caldera and the Lava Creek Tuff.
Both are natural formations which are composed of porous rock volcanic ash in Wyoming, Montana and Idaho.
Data suggests that the volcano erupts every 600,000 to 800,000 years – meaning that Yellowstone could erupt at any point.
One scientist, former university professor Ron Smith, believes the supervolcano could erupt soon.
During a lecture last week at the Dixie University in Utah, Mr Smith discussed the Yellowstone volcano and its current status.
READ MORE: Yellowstone: Scientist claims volcano could erupt ‘next week’
Hydrothermal eruptions take place in shallow reserves of hot water and steam.
They are reportedly less explosive than volcanic eruptions.
It comes as the volcano’s mantle rock extends westwards to Northern California and Oregon, a geologist has announced after making the shocking discovery.
The Yellowstone volcano mantle rock has spread sideways for more than 500 miles (804km) from Wyoming in Northwest US, moving deep below the Earth’s crust.
The mantle rock is a source of scorching, low-density rock that has fuelled the supervolcano’s past major eruptions.
For a long time, geologists have suspected Yellowstone sits on top of a mantle plume – long columns of hot rock that channel heat from deep inside of the planet.
Victor Camp, a geologist at San Diego State University (SDSU) in the US, has now found how the mantle rock has moved towards the Pacific over long periods of time.
He said: “Since the plume is not controlled by plate tectonics, it can rise and emerge anywhere on Earth, depending on where it manages to break through the Earth’s surface.
“So, knowing this will help us understand super-eruptions that have occurred before and those that will occur in the future.”