Yellowstone National Park Geysers, Old Faithful, Upper Geyser Basin
Yellowstone National Park Geysers such as Old Faithful and Grand Geyser, above, are predicable in their eruptions
Yellowstone National Park Geyser Old Faithful gets its name because it erupts approximately every 90 minutes, varying from between 51 to 120 minutes.
Yellowstone National Park is in reality a volcano, or more accurately, the sunken caldera of an ancient volcano that last erupted 640,000 years ago. The caldera, 30 miles wide by 45 ;miles long in a roughly oval shape, encompasses Yellowstone Lake, with depths of 430 feet, and the Yellowstone River, a course that conveys lake water through Yellowstone's Grand Canyon to the Missouri and Mississippi Rivers and eventually to the Gulf of Mexico.
The
volcanic nature of Yellowstone National Park accounts for the many geysers and hot springs including the famous Old Faithful Geyser, named because of its predictable nature.. Molten lava still flows beneath Yellowstone's surface, between 3 and 8 miles deep, and this causes the expulsion of superheated ground water that we see as steam spewing from the many geysers..
Yellowstone National Park's volcanic activity continues in the many geysers, fumaroles, hot springs, and mud pots located throughout the park.
The sunken caldera that forms Yellowstone National Park overlies an area of magma that sends
superheated steam to the surface.            Although the last eruption of the volcano was 640,000 years ago, the potential for another exists and could happen at any time.
Beneath the surface of the 30 mile by 45 ;mile caldera, molten rock or magma heats ground water and sends it boiling to the surface continually or as in the case of several
predictable geysers like Old Faithful and Grand Geyser, on a relatively predictable schedule.  The rangers post these eruption times at the geysers.
Old Faithful Inn
Much of Upper Geyser Basin is wheel chair and baby carriage accessible.  Wooden walkways extend through the field of Geysers.
Yellowstone National Park's volcanic nature spawns many geysers, fumaroles, hot springs, and mud pots, the most famous geyser being Old Faithful. Located at Upper Geyser Basin, Old Faithful has a predictable enough nature that rangers post the eruption times and viewers take a seat in a semi-circular grandstand to watch.
Castle Geyser, erupting every 13 hours
Yellowstone National Park's Upper Geyser Basin is the site of predictable geysers such as Old Faithful, Castle, Grand, Daisy, Riverside, and Great Fountain. Castle for instance, erupts every thirteen hours with a spray that can last 20 minutes.
Yellowstone National Park Geysers like Old Faithful, in Upper Geyser Basin erupt in predictable cycles.
Yellowstone National Park's most notable Geyser is Old Faithful, but it is just
one of many geysers in Yellowstone National Park that erupt predictably.
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