Kilauea Erupts Again: Episode 33 Active in the Summit Caldera
Kilauea on Hawaiʻi is once again putting on a spectacular display. In the early hours of September 19, at 3:11 a.m. HST, the 33rd eruptive phase since December 2024 began. Lava fountains are shooting up to 150 meters from Halemaʻumaʻu Crater, and the eruption plume is rising roughly 3,000 meters into the sky.
In the days leading up to the event, sporadic outflows of small lava streams had been observed. Beginning September 17, the vent gradually filled, accompanied by low fountains. Activity intensified during the night of September 18, before transitioning to sustained eruption on September 19. Instruments recorded strong deflation and a marked increase in seismic tremor — clear indicators of the start of the new episode.
For now, the lava flows remain confined to the floor of Halemaʻumaʻu Crater. Airports in Kona and Hilo are not affected, according to the USGS. Winds are carrying volcanic gases and fine particles southwest across the Kaʻū Desert.
Sulfur dioxide emissions are estimated at roughly 50,000 tons per day. Fine ash and Pele’s hair can be transported up to 30 kilometers downwind, while larger particles fall within a few kilometers of the vent.
The alert level remains at WATCH, and the aviation color code is ORANGE. USGS livestream cameras are capturing the glowing fountains in real time, offering a striking view of the ongoing eruption.