Photographs of Upper Geyser Basin, Yellowstone National ParkWyoming > Yellowstone National Park > The Southwest > Upper Geyser Basin > Map and Tour > Photographs
was named relatively recently, being inactive and unremarkable prior to an earthquake in 1959 that caused changes in the behavior of many of Yellowstone's thermal features. The geyser erupts on average once a day (intervals range from 8 to 36 hours), sending water up to 10 feet in the air over a period of five to ten minutes. The splashing and spray is enough to sustain shallow pools on the surrounding sinter, some with orange-brown algae. Excess water drains west into the Firehole River, 140 feet away.
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