Missing Magma Found: Huge Reservoir Beneath Yellowstone Park

Artist's representation of the upper magma chamber below Yellowstone. Credit: National Parks Service The supervolcano that lies beneath Yellowstone National Park is one of the world’s largest active volcanoes. Though it hasn’t erupted in 640,000 years, a huge volume of liquid magma exists underneath its surface. And now scientists say that volume has been underestimated. New studies of the volcano reveal a deeper magma reservoir that holds more than four times the magma volume previously known.