HVO scientists continue to monitor Kīlauea

USGS scientists use an Unmanned Aircraft System (UAS, or drone) to fly a MultiGas instrument along Kīlauea Volcano's lower East Rift Zone to determine concentrations of volcanic gases in small plumes rising from the now inactive fissures. The UAS is barely visible in the distance, just to the upper left of fissure 21 (larger cone at right).