Old Faithful

Old Faithful is a cone geyser in Yellowstone National Park, Wyoming. Its frequent eruptions are relatively predictable, though intervals vary with eruption duration.

Geyser: A hot spring that intermittently erupts water and steam when underground pressure is released. Old Faithful is a well-known example of this eruptive hot-spring type.
Upper Geyser Basin: A Yellowstone area containing one of the world’s densest concentrations of geysers. Old Faithful sits within this basin, among many contrasting hydrothermal features.
Washburn–Langford–Doane Expedition: A 1870 exploration of the Yellowstone region that helped establish public knowledge of its natural features. Expedition members recorded Old Faithful’s eruptions and helped popularize its name.
Geyser prediction: The estimation of when a geyser will erupt using observed patterns and measurements. Old Faithful’s forecasts use eruption duration and historical interval patterns.
Yellowstone tourism: Travel to Yellowstone National Park for its landscapes, wildlife, and geothermal features. Old Faithful is a central attraction that draws visitors to the park.
Hydrothermal system: A system in which heated water circulates through rock and fractures beneath Earth’s surface. The system supplies the heat and water that sustain Old Faithful.
Beehive Geyser: A Yellowstone geyser known for tall, forceful eruptions from a distinctive cone. Its powerful, less frequent eruptions contrast with Old Faithful’s routine schedule.
Nathaniel P. Langford: An American explorer and first superintendent of Yellowstone National Park. Langford described the geyser during the 1870 expedition and helped name it.
GeyserTimes: A project that collects and shares eruption observations for geysers, especially in Yellowstone. Its records help track Old Faithful’s eruptions and refine public forecasts.
Old Faithful Historic District: A designated historic area in Yellowstone centered on the Old Faithful developed landscape. The district preserves buildings and visitor facilities shaped by the geyser’s popularity.

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Steamboat GeyserCompared with: Its relative predictability contrasts with Steamboat’s irregular major eruptions.