Water from nearby springs had been deliberately diverted to create the illusion that the sanctuary was floating, as if on a mirror.
The concern surrounds volcanoes in the U.S., Mexico, Japan and elsewhere.
A recent study further unravels the mystery of Yellowstone's volcanic system.
The eruption lasted over eight minutes.
The satellite data usually isn't accessible, since commercial companies help gather it, but for emergency management, they're making an exception.
"Man, the changes would be so much bigger than anything we've ever seen."
Using a network of thousands of monitors, geologists realized New England isn't as peaceful as it looks.
The global events happen way more often than scientists thought.
Indonesia's Disaster Mitigation Agency set up an exclusion zone and ordered people to "immediately evacuate."
Injecting aerosols into the atmosphere in the Northern Hemisphere would be disastrous for parts of Africa, scientists say.
Research indicates a huge upwelling of hot rock lies beneath the ice of Antarctica's Marie Byrd Land.
And someday soon, we're going to regret it.
When it comes to eruptions, everything is unpredictable.
Ocean temperatures dropped five degrees Fahrenheit with each eruption.
At the time, volcanoes in Iceland were erupting 50 times more often than today.
"The research did not analyze the likelihood that another supereruption at Yellowstone would occur. Period."
The Ptolemaic Kingdom fell to the Roman Empire after the death of Cleopatra.
Scientists assess past eruptions to try to understand what will happen with the supervolcano.
There's no way to know how many eruptions are in the cards.
Authorities say evacuees will have to wait out the activity.
But authorities say they can't predict exactly when the blast will happen.