Kilauea the youngest and most active volcano on the Island of Hawai?i, erupted almost continuously from 1983 to 2018 at Pu?u?ō?ō and other vents along the volcano's East Rift Zone. From 2008 to 2018, there was a lava lake within Halema?uma?u crater at the volcano's summit. In 2018, Kīlauea experienced the largest lower East Rift Zone eruption and summit collapse in at least 200 years. An eruption from December 2020 to May 2021 fed a lava lake in Halema?uma?u crater at the summit. Since September 29, 2021, an eruption has been ongoing within Halema?uma?u crater. About 90 percent of the volcano is covered with lava flows less than 1,100 years in age.