Crystal Geyser
Coordinates: 38°56′18″N 110°08′08″W / 38.938253°N 110.135440°W
Crystal Geyser is located on the east bank of the Green River approximately 4.5 miles (7.25 km) downstream from Green River, Utah. It is a rare example of a cold-water carbon dioxide driven geyser; geothermal activity does not play a role in the activity of the geyser. The ground water near the geyser has significant quantities of dissolved carbon dioxide, along with substantial underground gas accumulations in the surrounding area. Saturation of the aquifer with CO2 creates enough pressure to force groundwater through the geyser and out on to the surface.
The geyser erupts sometimes to a height of 40 meters or more. During 2005, a study of the timing of the eruptions found them to be bimodal. About 66% of eruptions in the study occurred about 8 hours after the previous eruption, and the rest about 22 hours after. The geyser erupts for an average of one hundred minutes a day, with eruptions either lasting 7–32 minutes, or 98–113 minutes. The bimodal distribution of eruptions is not a well-understood pattern, but is found in other geysers, both cold-water and otherwise.
Between eruption events, the water level is approximately seventeen feet below the surface of the geyser—at the level of the water table. In the preface to an eruption, water surfaces, fills the pond around the geyser, and begins to bubble. Bubbling events occur with increasing frequency in the time leading up to an eruption, but are not constant; bubbling events last for a few minutes, with a few minutes of calm in between. Bubbling events at the main geyser also frequently alternate with bubbling events at natural side-pools.
The current form of the geyser was created by an exploration well drilled in 1935 in attempt to locate oil. The well was originally 800 metres deep, but an earlier owner of the land partially filled it in, meaning that the well is now only a couple hundred metres deep.
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