September 17, 2025 – Remains of overflow from north vent

At 8:38 a.m. HST on September 17, the Halema‘uma‘u north vent overflowed for the first time in advance of Kīlauea summit eruptive episode 33. Shortly thereafter, lava drained deeper in the vent and the overflow stopped, but Hawaiian Volcano Observatory geologists visiting the western crater rim an hour later could clearly see its remains: a fresh, silvery lobe of pahoehoe on the northeast side of the north vent, within the channel structure that remains from episode 32 on September 2. USGS photo by M. Zoeller.