Volcanic gas survey within Kīlauea caldera—July 22, 2021

On July 22, HVO scientists surveyed the floor of the down-dropped block within Kīlauea caldera for ​diffuse volcanic gas emissions. This particular part of the caldera floor subsided during Kīlauea's collapse events in 2018. 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. This photo shows two scientists surveying a portion of the caldera floor near the south sulfur bank, which was exposed in 2018 and is visible as the white-colored walls in the background of the photo. USGS image by K. Mulliken.