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Why does Old Faithful go off?

But because the water is deep underground it is also at a high pressure that prevents it from becoming steam. Eventually the superheated water becomes hot enough to vaporize, triggering an explosive eruption of water and steam at the geyser's vent.



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Geysers like Old Faithful in Yellowstone National Park erupt periodically because of loops or side-chambers in their underground plumbing, according to recent studies by volcanologists at the University of California, Berkeley.

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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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More than 1,000,000 eruptions have been recorded. Harry Woodward first described a mathematical relationship between the duration and intervals of the eruptions in 1938. Old Faithful is not the tallest or largest geyser in the park; those titles belong to the less predictable Steamboat Geyser.

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A 19-year-old was badly burned from an iconic geyser in Yellowstone National Park, officials said. Park rangers helped the woman at Old Faithful on Thursday. She had second- and third-degree burns over 5% of her body, park rangers said.

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If you've ever visited Old Faithful and the other geysers at Yellowstone National Park, you've likely come away with two reactions. First, it's one of the most captivating sights in all of nature. Second, the place stinks like rotting eggs.

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Old Faithful Geyser expels 3,700 to 8,400 gallons of water each time it erupts. During eruptions, the water in Old Faithful shoots from 106 to more than 180 feet (32-55 m) high.

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Since 1870, 22 people have died in the park after falling into the pools and geysers. One of the most recent deaths, in 2016, involved a man trying to soak in a geyser in the park. The man fell into the water and was boiled to death.

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