Grand Geyser

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Image:Yellowstone Grand Geysir 01.jpg Image:Yellowstone Grand Geysir 02.jpg

The Grand Geyser is a geyser in the Upper Geyser Basin of Yellowstone National Park in the United States. It is the tallest predictable geyser known. It was named by Dr. F.V. Hayden in 1871.<ref>Bauer, Clyde Max (1947). Yellowstone Geysers. Yellowstone Park, Wyoming: Haynes. ASIN B0007E44C4.</ref>

1 Eruptions
2 Sequence
3 References
4 External links

[edit] Eruptions

Grand's fountain reaches a height of as much as 200 feet (60 m), with a duration of 9–12 minutes. Its eruptions occur in a series of 1–4 bursts.<ref>Grand Geyser. Old Faithful Area Tour. Retrieved on 2005-09-16.</ref>

[edit] Sequence

Grand erupts every 7–15 hours. It belongs to the Grand Group (or Grand Geyser Complex), and its eruption is connected to those of the other geysers in the group, especially the adjacent Vent Geyser and Turban Geyser.<ref name=gosa>Grand Geyser. Geyser Observation and Study Association (GOSA) (2006). Retrieved on May 23, 2006.</ref>

For a few hours before an eruption by Grand, Turban Geyser erupts for a duration of five minutes about every 20 minutes. Grand's eruption begins within 1–2 minutes of one of Turban's eruptions with Vent Geyser erupting shortly after Grand. On occasions, Grand will stop erupting after 8 minutes only to restart with a taller fouintain a minute or two later. After Grand ceases its eruption, Vent and Turban continue erupting for another hour.<ref name=gosa />

Upon the finish of an eruption, Grand's pool is empty and takes about five hours to refill.<ref name=gosa/>