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 one of the most iconic geysers in the world, located in Yellowstone National Park, Wyoming, USA. It is part of the Upper Geyser Basin, the largest concentration of active geysers on the planet. The name was coined in 1870 during the Washburn-Langford-Doane Expedition and reflects the regularity of its eruptions, which occur approximately every 60 to 110 minutes, lasting 1.5 to 5 minutes. During an eruption, water can reach heights of up to 56 meters (184 feet), releasing between 14,000 and 32,000 liters of boiling water at an average temperature of 95.6°C (204°F).

Old Faithful's predictability stems from a complex hydrothermal system. Heat from underground magma warms water accumulated in a chamber, which eventually reaches boiling point and erupts. The interval between eruptions is monitored by the National Park Service (NPS) and varies based on the previous eruption's duration: a longer eruption typically results in a longer interval. Since 1983, the NPS has maintained precise records, allowing predictions within a 10-minute margin of error.

Interestingly, the name "Old Faithful" was inspired not just by punctuality but by the explorers' impression of fidelity upon seeing it erupt repeatedly. Today, it attracts about 4 million visitors annually to the park. The surrounding area features boardwalks and safe viewpoints, as the ground is unstable and the water extremely hot. In 2009, a minor earthquake slightly altered its pattern, but it remains active and reliable.

Besides Old Faithful, Yellowstone contains half of all geysers worldwide, but none surpass its fame. The geyser is part of North America's largest volcanic system, and its activity is a reminder of the powerful geothermal heat beneath the Yellowstone Caldera. To put it in perspective, the magma chamber under the park is about 80 kilometers long and feeds not only geysers but also hot springs and bubbling mud pots.

Frequently Asked Questions

How high does Old Faithful's eruption typically reach?

The eruption of Old Faithful averages between 30 and 56 meters (100 to 184 feet) in height, with frequent peaks near 50 meters.

How often does Old Faithful erupt?

Eruptions occur approximately every 60 to 110 minutes, depending on the duration of the previous eruption. Longer eruptions lead to longer intervals.

What is the temperature of the water during Old Faithful's eruption?

The water released reaches about 95.6°C (204°F), near the boiling point, but due to the park's altitude (2,400 m), the boiling point is around 93°C (199°F).