olcano is ready to jaime ukas is going to tell us. >> reporter: yellow stone is as beautiful as it isnpredictable. more than 3,000 square miles of hot springs, mud volcanos and, of course, geysers. >> there it goes. >> reporter: old faithful may be the park's most famous. but steam boat is now grabbing the spotlight as the world's largest active geiser. >> we see gas emissions, we see all kinds of thermal activity. that's what yellow stone does. it's one of the most dynamic places on earth. >> reporter: steam has erupted ten times in three months. prior to that, it erupted just ten times in 27 years. but volcanoologists don't know why there is so much activity at steam boat. >> when people start hearing steam boat geiser is going off, they're thinking, oh, my gosh, what if the big one happens. >> there's been a lot of hype about the super volcano of yellow stone and the potential for a super eruption. >> reporter: because this geiser field at yellow stone national park lies on top of an active volcano with multiple chambers of magma from deep beneath the couowldovexplosion means lava