Steam Vent at Mount Lassen Volcano
by Frank Wilson
Title
Steam Vent at Mount Lassen Volcano
Artist
Frank Wilson
Medium
Photograph - Photography
Description
Several groups of hot springs and fumaroles, remnants of former volcanic activity, exist in Lassen Volcanic National Park. Most of these lie in or are closely adjacent to Mount Tehama's caldera. As in many hydrothermally active areas, the rocks at Sulphur Works and Little Hot Springs Valley in Lassen Volcanic National Park have been chemically altered into bright-colored clays. Sulfurous acid and sulfuric acid have broken down hard, gray-green andesite lavas into red, yellow and buff clays and iron oxides. Many visitors pass through Sulphur Works on their way north on State Route 89 and sense the rotten-egg smell (hydrogen sulfide) when they pass by a hot vent to the east of the road. Sulphur Works is said to be the volcanic center of the ancestral Mount Tehama. Photograph exposed at f11 at 1/500 of a sec.with a 18 mm lens.
Uploaded
June 17th, 2015
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