HVO scientist samples volcanic gas from crack—Kīlauea summit, July 22
An HVO scientist samples the gas around a crack identified as emitting elevated levels of carbon dioxide (a volcanic gas) on the down-dropped block within Kīlauea caldera. The sample will later be analyzed to determine its complete chemical composition. This work was conducted within a closed area of Hawai‘i Volcanoes National Park, with park permission. Scientists wore hard hats as they worked in the vicinity of steep caldera walls, and they carried other safety gear such as gas masks and satellite communication devices. USGS image by K. Mulliken, taken on July 22, 2021.