Old Faithful - Yellowstone National Park, WY - Philatelic Photographs on Waymarking.com

"Old Faithful is a cone geyser located in Wyoming, in Yellowstone National Park in the United States. Old Faithful was named in 1870 during the Washburn-Langford-Doane Expedition and was the first geyser in the park to receive a name. The geyser, as well as the nearby Old Faithful Inn, is part of the Old Faithful Historic District.

Eruptions

Eruptions can shoot 3,700 to 8,400 U.S. gallons (14–32,000 litre) of boiling water to a height of 106–185 feet (30–56 m) lasting from 1.5 to 5 minutes. The average height of an eruption is 145 feet (44 m). The highest recorded eruption was 185 feet (56 m) high. Intervals between eruptions can range from 45 to 125 minutes, averaging 66.5 minutes in 1939, slowly increasing to an average of 90 minutes apart today. More than 137,000 eruptions have been recorded. Harry Woodward first described a mathematical relationship between the duration and intervals of the eruptions (1938). Old Faithful is not the tallest or largest geyser in the park; that title belongs to the less predictable Steamboat Geyser. Its popularity is more likely due to the small eruption window and high frequency.

Increasing interval

Over the years, the length of the interval has increased, which may be the result of earthquakes affecting subterranean water levels. These disruptions have made the earlier mathematical relationship inaccurate, but have in fact made Old Faithful more predictable. With a margin of error of 10 minutes, Old Faithful will erupt 65 minutes after an eruption lasting less than 2.5 minutes or 91 minutes after an eruption lasting more than 2.5 minutes. The reliability of Old Faithful can be attributed to the fact that it is not connected to any other thermal features of the Upper Geyser Basin."

-- Source

Stamp Issuing Country: United States Date of Issue: 1972 Denomination: 8 cents Color: Blue, white, and brown. Stamp Type: Single Stamp Relevant Web Site: [Web Link]

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