This story appears in the August 2009 issue of National Geographic magazine. Update: Our new Yellowstone National Park stories may surprise you with pictures of Yellowstone's remarkable animals.

Should Yellowstone approach eruption, we wouldn't know whether it ... as illustrated by the visual above. These start 50 kilometers (31 miles) below the surface and merge roughly 20 kilometers ...

Tourists at Yellowstone ran for cover as rocks fell from the sky following the explosion. The park said it did not reflect a change in the region’s volcanic system. Photo: Vlada March/National ...

Unlike smaller volcanic eruptions that primarily produce lava flows, a Yellowstone eruption would eject most of its magma as ash, creating colossal plumes that would blanket much of North America ...

Yellowstone National Park is noted for the geothermal marvels, but it is the threat below ground that holds the attention. Events such as the Black Diamond Pool explosion and current seismic activity ...

Despite an explosive summer at Yellowstone National Park — marked by a thermal feature eruption that destroyed a boardwalk and sent visitors fleeing from an eruption of black water, mud and ...

(Michael Poland/U.S. Geological Survey) In Yellowstone, 2024 will probably be remembered as the year of the hydrothermal explosion. There were two noteworthy such events, each important for ...

They’ve determined that current conditions aren't right for a major eruption, although sizable seismic activity can be expected in the coming decades. Describing Yellowstone's chances of ...