The Hot Creek Pools. There is plenty of evidence that the Long Valley Caldera is still active. The meltwater from the Sierras infiltrates to depths of several miles through faults where it is super-heated to 430F (220C); the high pressure keeps the water from boiling. Since hot water is less dense than cold water, it rises through steeply-inclined fractures and is discharged at hydrothermal springs at the surface along Hot Creek. The white material is calcium carbonate which precipitates out of the spring water as it cools. These calcium carbonate deposits reflect light very well; when light goes through the water, the red light is absorbed and blue light is reflected creating the vibrant blue color. The bluer the water, the hotter the water.
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