Kīlauea caldera gas mapping—August 3, 2021

HVO scientists continue their survey of Kīlauea caldera floor, including the down-dropped block, for ​diffuse volcanic gas emissions. This photo shows a large crack, on a portion of the caldera floor that subsided in 2018, that is emitting volcanic gas and steam. The caldera-wide ongoing gas survey will be compared to gas surveys done in the area prior to the 2018 collapse events and will reveal any changes in Kīlauea summit gas pathways and emissions. USGS photo by K. Mulliken on August 3, 2021.