YELLOWSTONE NATIONAL PARK — A new study suggests Yellowstone's supervolcano could become active in just a few decades if the right conditions developed. <br /> <br />Arizona State University researchers analyzed minerals in ancient fossilized ash from the most recent mega-eruption and believe the supervolcano became active after two injections of magma into the reservoir underneath the caldera, National Geographic reported. <br /> <br />They found the minerals showed that the critical changes in temperature and composition built up over a few decades. <br /> <br />Geologists previously thought it took centuries for supervolcanoes to go active. <br /> <br />Supervolcanoes have an eruption magnitude of 8 on the Volcano Explosivity Index (VEI) and spit out more than 1,000 cubic kilometers (240 cubic miles) of hot rock and ash, according to Science Alert. <br /> <br />For now Yellowstone's supervolcano hasn't shown any indications of an eruption, although experts agree there's no way of knowing when the next blast will occur.
