How are the waters at Yellowstone heated?

The overburden pressure from the load of the ice cap caused the underlying hydrothermal system to boil at higher temperature than today at a given depth beneath the land surface. Loading the Yellowstone hydrothermal system with ice or lake water is similar to pressure cooking.



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Yellowstone National Park isn't exactly known for its swimming holes. Due to the thermal activity in the park, most rivers and lakes in Yellowstone are closed to swimmers. However, if you're up for an adventure, the park has opened up a few alluring areas to the public.

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Don't touch any water in or around thermal features. Never swim, soak, or wade in thermal features. More than 20 people have died from intentionally entering or falling into hot springs.

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But Yellowstone's thermal features don't flow cold water like you're used to. Don't touch any water in or around thermal features. Never swim, soak, or wade in thermal features. More than 20 people have died from intentionally entering or falling into hot springs.

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Upper Geyser Basin The heat for the hydrothermal features comes from Yellowstone's volcano. Molten rock or magma may be as close as 3-8 miles (5-13 km) underground. Rain and snow supply water that seeps down several thousand feet (more than a kilometer) below the surface where it is heated.

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Old Faithful Geyser got its unique name in the 19th century because its eruptions were so regular and predictable. But during parts of the 13th and 14th centuries, the geyser did not erupt at all.

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Indeed, periods of decreased precipitation have been shown in modern times to result in less frequent eruptions of Old Faithful, and the new research indicates that severe, long-duration droughts can terminate eruptions. For now, Old Faithful remains just that—faithful, with eruptions occurring about every 90 minutes.

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The Yellowstone supervolcano last erupted about 640,000 years ago. A sleeping giant is nestled in the western part of the United States. Though it stirs occasionally, it has not risen from slumber in nearly 70,000 years.

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