Episode 28

Update: Episode 28 of the ongoing Halemaʻumaʻu eruption ended abruptly at 1:20 p.m. HST on July 9, 2025, after 9 hours of continuous fountaining, the final 8 of which were high fountaining. The north vent stopped erupting at approximately 1:20 p.m. HST, marking the end of the episode. The south vent did not appear to activate at all during this episode and has been completely covered by new deposits. The growing cone around the north vent has begun to connect with the top of the surrounding cliff in some places. Lava fountains reached up to approximately 1200 ft (365 m) during this episode. Volcanic gas emissions have greatly decreased since the end of fountaining. Lava flows from this episode on the floor of Halemaʻumaʻu within the southern part of Kaluapele (Kīlauea caldera) may continue to exhibit slow movement or incandescence as they cool and solidify over the coming days. Slumping of molten cone material around the vent may also continue for the next 24 hours and can produce small, localized lava flows. The Uēkahuna tiltmeter (UWD) recorded about 15 microradians of deflationary tilt during this episode. The end of the eruption was coincident with a rapid change from deflation to inflation at the summit and a decrease in seismic tremor intensity. --------------------------------------- Episode 28 of the ongoing Halemaʻumaʻu eruption began at 4:10 a.m. HST on July 9 and is currently exhibiting a vent overflow and fountains reaching roughly 150 feet (45 meters). Past episodes have produced incandescent lava fountains over 1000 feet (300 meters) high that result in eruptive plumes up to 20,000 feet (6000 meters) above ground level. High fountaining associated with this episode has not yet begun but is expected to start soon, as tremor, deflation, and fountain height are all increasing. According to USGS weather stations just southwest of the summit, winds are blowing from the north-northeast direction at approximately 15 miles per hour, which suggests that volcanic gas emissions and volcanic material will be distributed south-southwest. Such trade winds typically turn more to the northeast during daylight hours. All eruptive activity is confined to Halemaʻumaʻu crater within Hawaiʻi Volcanoes National Park Three Kīlauea summit livestream videos that show eruptive lava fountains are available here: https://www.youtube.com/@usgs/streams