Overview

• The episode began at 03:11 HST on September 19 after seismic tremor and tilt shifts confirmed onset following low fountains that started at 02:44.
• USGS reported multiple fountains during the roughly nine-hour burst, with some reaching about 800 feet and a plume rising to around 10,000 feet.
• All activity remained confined to Halemaʻumaʻu inside Hawaiʻi Volcanoes National Park, with no detected changes on the East or Southwest Rift Zones.
• The Volcano Alert Level stayed at WATCH with an ORANGE aviation code, and flights at Hilo and Kona airports continued without disruption.
• Officials estimated the episode produced more than 8 million cubic yards of lava as HVO warned of SO2, vog and glassy Pele’s hair carried downwind.