Overview
- A small hydrothermal explosion occurred in Biscuit Basin on Saturday, June 13, producing anomalous seismic and low‑frequency infrasound signals that were matched to a camera image of a dark jet from the ground.
- Geologists found three groups of newly opened vents and fissures that funneled near‑boiling water into the Firehole River, turning the flow milky and sending hot runoff downstream.
- Water measured at or near boiling in the new pathways, with reported temperatures between about 185°F and 200°F at Yellowstone’s elevation.
- Between June 14 and June 16 the ground collapsed to form a roughly 21 by 17 foot gray, silty boiling pool that later produced intermittent 20–30 foot spouts observed on June 18.
- No injuries were reported because Biscuit Basin has been closed since a larger 2024 blast, officials say the basin remains closed while scientists analyze the close‑range data and the USGS reports the broader volcanic system is at normal background levels.