A thin fluid sheet of pāhoehoe flowed from beneath the fractured crust of a tumulus (an inflated flow surface that is pushed upward) and quickly filled in nearby low areas. This surface flow, which is from the June 26 breakout, was close to the base of the pali. The tumulus pictured here is roughly 3 m (10 ft) tall. Photo taken Thursday, October 26, 2017 courtesy of USGS/HVO