New Blue Hole Discovery at Norris Geyser Basin (2025)
Breaking Discovery: Geologists have discovered a new blue thermal pool at Yellowstone's Norris Geyser Basin, formed through a series of hydrothermal explosions between late December 2024 and early February 2025.
About the Discovery
The new thermal feature was first observed by U.S. Geological Survey scientists in April 2025 during routine maintenance of temperature logging stations in the Porcelain Basin area. The pool was not present during their previous visit in fall 2024, indicating its recent formation.
Physical Characteristics
- Size: Approximately 13 feet in diameter
- Depth: About 1 foot deep below the rim
- Color: Light blue water
- Location: Porcelain Basin sub-basin, west of "Tree Island"
- Surroundings: Small rocks about 1 foot across, covered by light gray, sandy mud
Formation Process
According to the U.S. Geological Survey, this thermal pool formed as a result of hydrothermal explosions—events caused by pressure changes that result from the transition of liquid water to steam. Unlike single major explosive events, this feature appears to have formed through multiple small explosions that:
- Initially threw rocks from the site
- Later ejected silica mud over short distances
- Created a small pit that eventually filled with silica-rich water
Timeline of Formation
High-resolution satellite imagery helped scientists track the development:
- December 19, 2024: No thermal feature visible
- December 25, 2024: Estimated start of formation activity
- January 6, 2025: Depression visible in satellite images
- February 13, 2025: Pool filled with water
- April 2025: Official discovery during field maintenance
Scientific Significance
This discovery highlights the dynamic nature of Yellowstone's geothermal system. The Norris Geyser Basin is considered the most dynamic area in Yellowstone, and such hydrothermal explosions are not uncommon. A monitoring station installed in 2023 can now detect geophysical data indicating these explosive events, helping scientists better understand these natural phenomena.
Recent Hydrothermal Activity
This new blue hole is part of ongoing geological activity at Yellowstone:
- April 2024: Small explosion at Porcelain Terrace created a crater several feet across
- July 2024: Hydrothermal explosion at Biscuit Basin near Old Faithful
- 2025: New blue hole discovery at Norris Geyser Basin
Visiting Information
Current Access: The new thermal pool can be viewed from the established boardwalks and overlooks in the Norris Geyser Basin area. As always, visitors must stay on designated paths and maintain safe distances from all thermal features.
Safety Reminders
- Stay on boardwalks and marked trails at all times
- Thermal water temperatures can exceed 200°F (93°C)
- Ground around thermal features can be thin and unstable
- Never touch thermal features or throw objects into them
- Supervise children closely
For the latest information on this discovery and Yellowstone's geothermal features, visit the official Yellowstone National Park website and the U.S. Geological Survey Yellowstone Volcano Observatory.