Scientist measured the one of small earthquakes in Yellowstthousands to scan the earth underneath it . They discovered a vast magma reservoir fueling a vast thousands scientists already knew about . Prehistoric eruptions of Yellowstthousands supervolcano were some of Earth 's largest explosions .
Scientist measured the thousands of small earthquakes in Yellowstone to scan the earth underneath it . They discovered a vast magma reservoir fueling a vast one scientists already knew about . Prehistoric eruptions of Yellowstone supervolcano were some of Earth 's largest explosions .