On Saturday morning, a dramatic eruption occurred at Black Diamond Pool in Yellowstone National Park, described by U.S. Geological Survey volcanic experts as “Kablooey!” The video footage released by the agency shows mud erupting from the pool shortly before 9:23 a.m., located in Biscuit Basin—a popular spot between the renowned Old Faithful geyser and the vibrant Grand Prismatic Spring.

This eruption is part of a series of so-called dirty eruptions that have been sporadically occurring since July 2024, when a previous hydrothermal explosion sent debris flying hundreds of feet into the air, leading to damage and a temporary closure of the area.

Experts have noted that other eruptions in recent months have generally been hard to observe, often occurring at night or obscured by ice, but the clear weather conditions last weekend allowed for a well-documented event. USGS emphasized that the new monitoring equipment—installed this summer, including cameras and seismic sensors—has improved their ability to capture and analyze such eruptive events.

Yellowstone National Park is home to the world’s most extensive collection of hydrothermal features, boasting over 10,000 such formations, including more than 500 geysers. Recent analysis indicates no definitive patterns or precursors to the eruptions at Black Diamond Pool, emphasizing the unpredictable nature of geothermal activity in the region.