Collapse to Caldera
Kilauea is presently one of the most productive volcanoes on Earth (in terms of how much lava it erupts each year). To the casual observer, Kilauea appears to be part of the larger volcano Mauna Loa, but geological data indicates that it is a separate volcano with its own vent and conduit system
The summit presently has a caldera that is roughly 2.5-miles by 2-miles wide, and walls nearly 400-feet. Another feature, known as Halemaʻumaʻu crater, lies within the main caldera (on the southwestern side.) The Puʻu ʻOʻo eruption started on January 3, 1983, the southern part of the caldera.