Measuring gases from Kīlauea's summit eruption - September 11, 2023

Hawaiian Volcano Observatory gas scientists observed and measured the plume of volcanic gas being erupted from Kīlauea's summit on during the afternoon of September 11, 2023. The plume being generated by the ongoing eruption, visible in the right side of the image, is sulfur-dioxide (SO2) rich, but also contains water vapor, carbon dioxide, and halogen gases such as HCl and HF. USGS image by T. Nadeau.