A new 3-D model shows the 45-mile-wide (72-kilometer-wide), 410-mile-deep (660-kilometer-deep) plume of hot, molten rock rising under Yellowstone's supervolcano.
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Two large reservoirs full of magma exist beneath the Yellowstone Caldera—one that's about three to ten miles beneath the surface, and another that's 12 to 30 miles below ground.
The U.S. Geological Survey (USGS) also states that it is very unlikely that a nuclear blast could trigger an eruption of Yellowstone. The now-dormant volcano has been undisturbed by much greater releases of energy in the form of earthquakes.
How large is the magma chamber that is currently under Yellowstone? The magma chamber is believed to be about 40 by 80 kilometers across, similar in size to the overlying Yellowstone caldera. The top of the chamber is about 8 km deep and the bottom is around 16 km deep.