51.5 MB (5.1 MB compressed)
5257 x 3423 pixels
44.5 x 29.0 cm ⏐ 17.5 x 11.4 in (300dpi)
KENNETH H. THOMAS / SCIENCE PHOTO LIBRARY KENNETH H. THOMAS / SCIENCE PHOTO LIBRARY
Castle Geyser is a very old geyser estimated to be between 5,000 to 15,000 years. Its considered a cone-type geyser with its eruption interval between 9 and 11 hours. A 20 minute water phase of the major eruption is followed by a 40 minute steam phase. Castle occasionally has minor eruptions which last only a few minutes. The minors start similarly to the major eruptions but abruptly stop after a few minutes. When this happens, Castle becomes unpredictable until it has its next major eruption. Yellowstone National Park. USA. Spring.
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