Geysers are spectacular hydrothermal events. The word geyser is derived from an old Icelandic verb, gjose, meaning to erupt. It refers specifically to a reservoir of hot water that intermittently and explosively ejects part or all of its contents. Activity in most geyser areas ranges over a wide spectrum: quiescent hot pools, vigorously boiling pools, dry stream jets, mud pots, and geysers (Fig. 1–1). Although there are several thousand hot springs in the world, there are not more than about 400 geysers. In Yellowstone National Park, the most extensive geyser area, the ratio of hot springs to geysers is about ten to one.
KeywordsLower Basin Superheated Water Taupo Volcanic Zone Major Eruption Thermal Area
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