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Looking down into the vent cavity of the Halema‘uma‘u Overlook vent. The black ring on the walls surrounding the lava pond is a high lava mark, outlining the height the lava rose during a recent rise/fall cycle.
Earlier this week, lava began erupting from a vent on the floor of Pu‘u ‘Ō‘ō crater. The mound on the right side of the photo is the vent producing lava flows, slowly filling the east side of the crater.