USGS: Episode 26 of the ongoing Halemaʻumaʻu eruption began at approximately 1:40 a.m. HST on June 20, 2025, with lava fountains and flows erupting from the north vent. Lava fountains are currently reaching heights of over 1,000 feet (300 meters).

According to the National Weather Service, winds are blowing from the north direction, which suggests that volcanic gas emissions and tephra from the lava fountain may be distributed south of Halema'uma'u caldera.

Episode 26 was preceded by small, sporadic spattering and lava overflows from the north vent that began at approximately 11:26 p.m. and continued to increase in intensity until 1:40 a.m., when sustained fountaining began. Fountains from north vent are 800 feet (250 meters) high and feeding a lava flow at 1:55 a.m. HST.

Inflationary tilt reached just over 15.3 microradians since the end of the last episode. Seismic tremor began increasing and tilt at UWD switched from inflationary to deflationary at about 1:40 a.m. HST, about the ...