May 25, 2025: Lava Fountaining Soars 1000ft into the Air at Kilauea Volcano, Hawaii (CAM C)

USGS Report: Episode 23 of the ongoing Halemaʻumaʻu eruption began at 4:15 p.m. HST on May 25 with the onset of sustained lava fountains. Lava flows are covering the floor of Halema'uma'u crater. Activity began in the north vent, which escalated to high fountains by 4:50 p.m. The south vent followed with smaller fountains by 5:15 p.m. As of 5:20 p.m., lava fountains from the south vent are about 230 feet (70 meters) in height while lava fountains from the north vent are exceeding 1,000 feet (300 meters) in height.

Inflationary tilt at UWD reached just over 12 microradians since the end of the last episode and changed quickly to deflation when sustained fountaining began. Seismic tremor began increasing at 4:36 p.m. at the same time that fountaining increased in height and volume.

Sulfur dioxide (SO2) emission rates are estimated to be approximately 50,000 t/d during fountaining events.

Most episodes of Halemaʻumaʻu lava fountaining since December 23, 2024, have continued for around a day or less and have been separated by pauses in eruptive activity lasting generally at least several days. https://www.youtube.com/@usgs