Old faithful eruption

Old Faithful is the most famous geyser in Yellowstone National Park, United States, known for its predictable and spectacular eruptions.

About this subject

Old Faithful is a geyser located in Yellowstone National Park, Wyoming, USA. It was named in 1870 during the Washburn-Langford-Doane Expedition, being the first geyser in the park to receive a name. Its fame derives from the relatively regular frequency of eruptions, which occur approximately every 60 to 110 minutes, lasting 1.5 to 5 minutes, and expelling water to heights of 30 to 55 meters.

Old Faithful's predictability is not perfect but has made it a tourism icon. The interval between eruptions can be influenced by the duration of the previous one, monitored by the National Park Service. It is estimated that over a million eruptions have occurred since its discovery. Water temperature reaches up to 95°C at the surface, while steam can surpass 200°C.

Yellowstone's hydrothermal system is fed by a shallow magma chamber, which heats underground water. Old Faithful is part of the Upper Geyser Basin, the largest concentration of geysers in the world. The name “Old Faithful” was chosen because the geyser never failed to erupt daily, although today annual visitors exceed 4 million, making the area a prime observation point.

Trivia: In 1959, an earthquake altered Old Faithful's eruption pattern, but it gradually returned to its usual behavior. The geyser is not the tallest in Yellowstone (Steamboat Geyser is higher) but remains the most popular due to its reliability.

Frequently Asked Questions

How often does Old Faithful erupt?

Eruptions occur approximately every 60 to 110 minutes, but the interval can vary. The time is predicted based on the duration of the previous eruption.

How high does Old Faithful's eruption reach?

Water can reach between 30 and 55 meters in height, and each eruption lasts 1.5 to 5 minutes, expelling thousands of liters of hot water.

Is Old Faithful the largest geyser in Yellowstone?

No. The largest is Steamboat Geyser, which can spray water over 90 meters. Old Faithful is the most famous due to its predictability.