August 2014 – Yellowstone Park, Wyoming
Photo taken by Vasiliki Papacharalambous
Old Faithful, named by members of the 1870 Washburn Expedition, was once called “Eternity’s Timepiece” because of the regularity of its eruptions. However, despite the myth, this geyser has never erupted at exact hourly intervals, nor is it the largest or most regular geyser in Yellowstone. However, it does erupt more frequently than any other of the large geysers.
An Old Faithful eruption lasts 1.5 to 5 minutes and reaches a height of 90-184 feet (27-55 m). The period of time between Old Faithful’s eruptions ranges from 35 to 120 minutes.