Old Faithful is a cone geyser in Yellowstone National Park in Wyoming, United States. It was named in 1870 during the Washburn–Langford–Doane Expedition and was the first geyser in the park to be named. It is a highly predictable geothermal feature and has erupted every 44 minutes to two hours since 2000. The geyser and the nearby Old Faithful Inn are part of the Old Faithful Historic District.
The geothermal areas of Yellowstone include several geyser basins in Yellowstone National Park as well as other geothermal features such as hot springs, mud pots, and fumaroles. The number of thermal features in Yellowstone is estimated at 10,000. A study that was completed in 2011 found that a total of 1,283 geysers have erupted in Yellowstone, 465 of which are active during an average year. These are distributed among nine geyser basins, with a few geysers found in smaller thermal areas throughout the Park. The number of geysers in each geyser basin are as follows: Upper Geyser Basin (410), Midway Geyser Basin (59), Lower Geyser Basin (283), Norris Geyser Basin (193), West Thumb Geyser Basin (84), Gibbon Geyser Basin (24), Lone Star Geyser Basin (21), Shoshone Geyser Basin (107), Heart Lake Geyser Basin (69), other areas (33). Although famous large geysers like Old Faithful are part of the total, most of Yellowstone's geysers are small, erupting to only a foot or two. The hydrothermal system that supplies the geysers with hot water sits within an ancient active caldera. Many of the thermal features in Yellowstone build up sinter, geyserite, or travertine deposits around and within them.
Grand Geyser is a fountain geyser in the Upper Geyser Basin of Yellowstone National Park in the United States. It is the tallest predictable geyser known. It was named by Ferdinand Vandeveer Hayden in 1871.
The Fountain Paint Pot is a mud pot located in Lower Geyser Basin in Yellowstone National Park.
Vent Geyser is a geyser in the Upper Geyser Basin of Yellowstone National Park in the United States.
Turban Geyser is a geyser in the Upper Geyser Basin of Yellowstone National Park in the United States.
Daisy Geyser is a geyser in the Upper Geyser Basin of Yellowstone National Park in the United States.
Excelsior Geyser Crater, formerly known as Excelsior Geyser, is a dormant fountain-type geyser in the Midway Geyser Basin of Yellowstone National Park in the United States. Excelsior was named by the Hayden Geological Survey of 1871.
Pump Geyser is a cone geyser located in the Upper Geyser Basin of Yellowstone National Park. It is in the Geyser Hill Complex which includes Aurum Geyser, Beehive Geyser, Big Cub Geyser. Doublet Pool, Giantess Geyser and Lion Geyser, among others.
Jet Geyser is a geyser in the Lower Geyser Basin of Yellowstone National Park in the United States. Jet Geyser is in the Fountain Group that includes Fountain Geyser, Morning Geyser, Red Spouter and Silex Spring.
Giant Geyser is a cone-type geyser in the Upper Geyser Basin of Yellowstone National Park in the United States. Giant Geyser is the namesake for the Giant Group of geysers, which, on its platform, includes Bijou Geyser, Catfish Geyser, Mastiff Geyser, the "Platform Vents," and Turtle Geyser. Giant Geyser's Platform, a raised stone structure incorporating all these geysers. Giant is notable for its spectacular, but sporadic eruptions, as well as for its very large cone of geyserite, which stands about 12 feet tall.
Economic Geyser is a geyser in the Upper Geyser Basin of Yellowstone National Park in the United States.
Grotto Geyser is a fountain-type geyser located in the Upper Geyser Basin in Yellowstone National Park in the United States. Grotto Geyser is the namesake for the group of geysers that includes Grotto Fountain Geyser, South Grotto Fountain Geyser, Indicator Spring, Spa Geyser, Startling Geyser, and Rocket Geyser.
Jewel Geyser is a fountain geyser in the Upper Geyser Basin of Yellowstone National Park in the United States. It is in the Biscuit Basin complex that includes Black Diamond Pool, Black Opal Spring, Wall Pool, Sapphire Pool, Shell Spring, Silver Globe Spring, Avoca Spring, West Geyser, the Mustard Springs, Coral Geyser, and Black Pearl Geyser.
Sawmill Geyser, named for the whirring sound it makes during its eruption, is a geyser in Yellowstone National Park, Wyoming, United States. The geyser was named by Antoine Schoenborn of the Hayden Geological Survey of 1871.
Penta Geyser sits a few feet off the path adjacent to Spasmodic Geyser in the Upper Geyser Basin of Yellowstone National Park, Wyoming, United States.
Bulger Geyser is located in the Upper Geyser Basin of Yellowstone National Park, Wyoming. Bulger Geyser is 200 feet (61 m) south of Grand Geyser. It erupts frequently, with both major and minor eruptions. As with most geysers, the minor eruptions are the most common. They have a duration of seconds. Major eruptions are infrequent, but they have durations as long as 12 minutes. Either way, the play consists of somewhat vigorous bursting 1–12 feet high.
West Triplet Geyser is a geyser in the Upper Geyser Basin of Yellowstone National Park, Wyoming. West Triplet Geyser is 85 feet (26 m) south of Grand Geyser. Its activity is related to that of Grand and Rift geysers. West Triplet erupts to a height of about 10 feet (3.0 m), usually during Grand's quiet periods. Before 1947 it displayed regular activity, erupting about every three hours.
Spasm Geyser is a geyser in the Lower Geyser Basin of Yellowstone National Park in the United States.
Semi-Centennial Geyser is located just north of Roaring Mountain in Yellowstone National Park in the U.S. state of Wyoming. Situated next to the Grand Loop Road, the geyser was first noticed when it had a few small eruptions in 1919. A few years later at 6:40am on August 14, 1922 the geyser erupted in the first of a series of increasingly violent eruptions. By the afternoon on the same day reports stated that the ejected water was exceeding 300 feet (91 m) in height. By the evening of the 14th, the geyser had scattered debris and rocks a distance of 450 ft (140 m) from the crater. Short lived, Semi-Centennial Geyser has been quiet since and a small pool of water now exists where the geyser erupted. As the geyser showed its biggest activity in 1922, the 50th anniversary of the establishment of Yellowstone National Park in 1872, it was accorded the name of Semi-Centennial.
Not erupting, 2014
At sunset, 2017
1960
From a distance, 1965
2003
People watching Clepsydra Geyser erupt, 2015
