Summit deflation over the past day occurred as part of a deflation-inflation (DI) event, and, as usual with deflation, the lava lake level dropped. Over the past two days the lake level has dropped about 20 m (66 ft). The previous level is marked by the top of the black ring of lava veneer on the Overlook crater wall (visible just to the left of the spattering sites). Photo taken Friday, July 28, 2017 courtesy of USGS/HVO