Overview
- The USGS camera recorded muddy water and debris blasting from Black Diamond Pool just before 9:23 a.m. MST on December 20.
- Plumes in these events typically reach about 30–40 feet, and this is the clearest daytime footage in recent weeks after several overnight or obscured eruptions.
- Since the webcam was installed in May 2025, roughly a dozen eruptions of varying size have been documented by video and by seismic and infrasound data.
- A larger hydrothermal explosion on July 23, 2024 damaged a boardwalk and led to the ongoing closure of Biscuit Basin to visitors.
- USGS analyses point to silica clogging in the hot spring’s plumbing as the likely trigger for the 2024 blast, and new cameras plus seismic, acoustic, and temperature sensors are helping track activity that officials stress is not indicative of an impending volcanic eruption.