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Clear conditions provided good views into the deep crater at Pu‘u ‘Ō‘ō. No active lava or signs of increased activity were observed here. The crater walls expose a clear sequence of lava flows and cinder that built the cone in the early 1980s.
This 3D model of Pu‘u ‘Ō‘ō's crater was created from thermal images during an overflight of the cone. The deepest portion of the crater is about 320 meters (1050 feet) below the crater floor that existed prior to April 30.
Fissure 22 was active in late May near Lanipuna Gardens subdivision, which is now mostly buried by lava flows. During the later stages of Fissure 22 activity, small strombolian-style explosions built a symmetric cinder cone over the vent.