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  Spasmodic Geyser
Feature Type: Geyser
Geyser/Spring Type: Fountain geyser

Basin
Upper Geyser Basin
Complex
Grand and Castle Group

Spasmodic is a fun geyser. It erupts from at least 20 vents. During the eruption, the activity overall is nearly constant but the activity cycles through the various vents every few minutes. Some vents only erupt a few inches while the tallest can reach ten feet. Intervals are about 1 to 3 hours. Durations range from minutes to hours. Spasmodic is in eruption about one third of the time.

Spasmodic is active during both the Sawmill Mode and the Penta-Churn Mode. In either case, Spasmodic usually precedes these other geysers.


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One of the many vents of Spasmodic Geyser. Throughout the eruption, each of the various vents play in different combinations and different strengths. Making this a fun geyser to just sit and watch for a few minutes.

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Please note - this site is currently under constuction. Please visit for more information.  Last update 08-17-11

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