Pu'u 'Ō'ō Eruption of Kīlauea Volcano, Hawai'i -- Episode 21 Through Early Episode 48, June 1984 - April 1987 [open pdf - 46MB]
"The Pu'u 'Ō'ō eruption from the middle East Rift Zone of Kīlauea Volcano began in January 1983 with intermittent activity along several fissures. By June 1983, the eruption had localized at the Pu'u 'Ō'ō vent and the activity settled into an increasingly regular pattern of brief eruptive episodes characterized by high lava fountains. The first 18 months of the eruption (episodes 1-20) are chronicled in previous publications. [...] The volcano was primed for the 48th episode of high fountaining on July 18, 1986, when the conduit beneath Pu'u 'Ō'ō ruptured again and magma erupted through new fissures at the base of the cone on both its uprift and downrift sides."
Scientific Investigations Report 2018-5109
U.S. Geological Survey: https://www.usgs.gov/