Yellowstone geyser

Yellowstone National Park's geysers form the world's largest concentration of hot springs, with over 500 active jets drawing millions of visitors annually.

About this subject

Yellowstone is home to the world's largest geyser field, primarily in the Upper and Lower Geyser Basins. The most famous is Old Faithful, erupting about every 90 minutes and shooting hot water up to 56 meters high. These geothermal phenomena result from the dormant supervolcano beneath the park, heating groundwater to over 200°C. Accumulated pressure forces water to burst out in periodic jets.

The diversity of geysers is impressive: some are continuous, others unpredictable. Steamboat Geyser, for instance, is the tallest active geyser in the world, with eruptions reaching 91 meters, though its intervals vary from days to years. Geyser water contains dissolved silica, which forms mineral deposits called geyserite, creating colorful formations around the vents. The intense blue color of some hot springs, like Grand Prismatic Spring, is due to thermophilic bacteria that absorb light at specific wavelengths.

Culturally, Yellowstone is an icon of the U.S. national park system, established in 1872 as the world's first national park. Native American tribes, such as the Shoshone and Crow, knew the area long before European arrival, using the hot springs for ceremonial and medicinal purposes. Today, preserving geysers is critical, as any human interference or climate change can alter their behavior. Visitors must stay on designated trails and never touch the water, which can cause severe burns.

Frequently Asked Questions

How many geysers are in Yellowstone?

There are over 500 active geysers in Yellowstone National Park, representing about half of all geysers worldwide.

Which is the tallest geyser in Yellowstone?

Steamboat Geyser is the tallest, with eruptions reaching up to 91 meters (299 feet), surpassing Old Faithful.

Why is the water of the geysers colored?

The vivid colors come from thermophilic bacteria and algae living in the hot water. Each color indicates a temperature range, with deep blue resulting from selective light absorption by these microorganisms.