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Fan & Mortar GeysersFan and Mortar Geysers are in close proximity to one another and almost always erupt in concert. The interval between eruptions ranges from 1-1/2 days to months. Most eruptions last about 45 minutes. Mortar Geyser, pictured here, erupts to heights of 40 - 80 feet while Fan can reach heights of 100 - 125 feet.
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