The Washburn Expedition in 1870 named Old Faithful for its regular schedule of eruptions and is the grand old geyser of Yellowstone National Park which this crowd are awaiting, on 7th August 2007 in Wyoming, United States. The intervals between eruptions average between 45-90 minutes and the average duration is about four minutes. To predict the next eruption, its first continuous surge is timed until the final splash.
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