Full Breakdown
New Hydrothermal Explosion Reshapes Yellowstone’s Biscuit Basin
6/23/2026, 11:09:07 AM
Event Overview: June 13, 2026 Explosion in Biscuit Basin
At 5:09 a.m. MDT on 13 June 2026, a hydrothermal explosion occurred north of Black Diamond Pool in Biscuit Basin, Yellowstone National Park. Remote cameras, seismic sensors, and infrasound instruments recorded a plume of steam and low-frequency acoustic signals. The basin has been closed to the public since 2024, so no visitors were affected.
Background: Prior Hydrothermal Activity and 2024 Explosion
Biscuit Basin has a century-long record of hydrothermal explosions, notably a larger blast on 23 July 2024 at Black Diamond Pool. The 2026 event continues a pattern of sudden releases of superheated water that reshape the basin’s surface.
Timeline of Recent Developments
- 13 June 2026, 5:09 a.m. – Explosion captured by monitoring equipment; seismic energy and acoustic signal detected.
- Morning 13 June – Park staff observed two new runoff channels delivering water and sediment to the Firehole River, turning a river segment milky.
- 15 June – Yellowstone Geology Program documented three new vent groups and a 21-by-17-foot pool of silty, near-boiling water.
- 18 June – The new pool exhibited intermittent geyser-like spouting, reaching 20-30 ft (6-9 m). Temporary seismic stations were installed to monitor ongoing activity.
Data & Statistics
- Vent formation: Three new vent groups, including an 18.5-meter (61-ft) fissure filled with boiling water.
- New pool dimensions: Approximately 21 ft × 17 ft (6.4 m × 5.2 m).
- Ejection distance: Rocks displaced only a few meters, indicating lower explosive energy than the 2024 event.
- Water discharge: Sediment-laden runoff created a milky streak in the Firehole River extending downstream.
- Spouting height: Observed eruptions reached 20-30 ft (6-9 m).
On-the-Ground Observations
Park personnel noted the emergence of runoff channels and the discoloration of the Firehole River. Geologists reported abundant hydrothermal water, three vent groups, and the newly formed boiling pool. Video from the monitoring camera captured a steam plume north of Black Diamond Pool shortly after the explosion.
Official Statements & Responses
Scientists from the Yellowstone Volcano Observatory (YVO) described the event as “unstable and hazardous” and emphasized Biscuit Basin’s long-standing propensity for hydrothermal explosions. YVO officials said the blast offers a rare opportunity to study warning signs for such hazards. Monitoring equipment, including temporary seismic stations, has been deployed, and the basin remains closed to visitors.
Why It Matters: Hazard Assessment and Research Opportunity
The incident underscores the dynamic nature of Yellowstone’s thermal systems and the potential risk to public safety. Understanding the mechanisms that triggered the 2026 explosion may improve early-warning capabilities for future hydrothermal events across the park.
Verbatim Quotes
- “These vents represent pathways where water at or even slightly above boiling temperatures beneath the ground suddenly found a pathway to the surface and flashed to steam, driving a hydrothermal explosion,” — Caldera Chronicles, Yellowstone Volcano Observatory
- “The recent explosion emphasizes the unstable and hazardous nature of some of Yellowstone’s thermal areas,” — Caldera Chronicles, Yellowstone Volcano Observatory
- “Biscuit Basin, and especially the area around Black Diamond Pool, has been a site of numerous hydrothermal explosions for more than a century. … The June 13, 2026, explosion thus offers an unprecedented opportunity to better understand this critical hazard in Yellowstone National Park and perhaps learn more about their potential warning signs.” — Caldera Chronicles, Yellowstone Volcano Observatory
- “On June 18, the pool had several few-minute episodes of spouting where it sent boiling water to a height of 20 to 30 feet.” — Caldera Chronicles, Yellowstone Volcano Observatory
Conflicting Reports & Gaps
All sources agree on the explosion’s location, timing, and primary effects. Minor variation exists in describing the new pool—one account gives precise dimensions (21 × 17 ft), another refers to a “circular collapse feature” filled with near-boiling water—but both confirm a newly formed hot water body. No other discrepancies were identified.
What’s Next: Ongoing Monitoring and Future Plans
YVO scientists will continue analyzing data from the temporary seismic stations to track vent evolution and pool behavior. Additional field visits are planned to monitor changes in vent activity, water chemistry, and downstream impacts on the Firehole River. The basin will stay closed until safety assessments are completed.
