Supervolcano danger under Old FaithfulUpdated 1706 GMT (0006 HKT) April 24, 2015 6 photos: Supervolcano danger under Old FaithfulYellowstone National Park's Grand Prismatic Spring, the park's largest hot spring, makes for a stunning photo in this aerial shot.Hide Caption 1 of 66 photos: Supervolcano danger under Old FaithfulUnderneath the picturesque Yellowstone National Park, in the U.S. state of Wyoming, is a supervolcano with the potential to change life on Earth.Hide Caption 2 of 66 photos: Supervolcano danger under Old FaithfulDr Bob Smith believes a supervolcano eruption under Yellowstone would cover the western U.S with ash that would also enter the jet stream potentially crippling air travel and the world's food supply.Hide Caption 3 of 66 photos: Supervolcano danger under Old FaithfulOld Faithful is one of Yellowstone's most popular geological features. Underground is an enormous plume of very hot rock which fuels every bubbling pool and geyser in the park. Hide Caption 4 of 66 photos: Supervolcano danger under Old FaithfulScientists at the Yellowstone Volcano Observatory at the University of Utah are constantly monitoring the underground supervolcano for ground movements and earthquake activity.Hide Caption 5 of 66 photos: Supervolcano danger under Old FaithfulThey measure seismic readings of the frequent earthquakes happening in and around Yellowstone National Park. Earthquakes can be indicators to when the next supervolcanic eruption would occur.Hide Caption 6 of 6Supervolcano under Old FaithfulMore from USOregon standoff: FBI surrounds occupiers at wildlife refugeRoyal Caribbean apologizes to Anthem passengers battered by stormJustice Department sues Ferguson over police conductU.S. Department of Justice suing FergusonTed Cruz spokesman: Trump's bid a 'Seinfeld candidacy'