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The Old Faithful Geyser, located in Yellowstone National Park, is perhaps the world's most famous geyser. The geyser was named in [[1870. An eruption can shoot ~32,000L of boiling water[?] to a height of 56.1m. 137,000+ eruptions have been recorded, lasting from ~1.5-5.5 minutes, with intervals of between ~30-120 minutes. Harry M. Woodward first described a mathematical relation between the duration and intervals of the eruptions (1938). Over the years, the length of the intervals has increased; possibly the result of earthquakes affecting subterranean water levels.

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