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Lava within the west pit at Pu‘u ‘Ō‘ō has continued to rise since HVO's previous overflight (March 27) and has formed a perched lava pond (center) contained within a levee. This levee, formed by an accumulation of hardened lava, confines molten lava to the perched pond, which allows the lava surface to rise higher than the west pit floor. If the pond rises high enough, lava can spill over the levee, forming small flows around the margin of the perched pond. Photo taken Friday, April 13, 2018 courtesy of U.S. Geological Survey

Lava within the west pit at Pu‘u ‘Ō‘ō has continued to rise since HVO’s previous overflight (March 27) and has formed a perched lava pond (center) contained within a levee. This levee, formed by an accumulation of hardened lava, confines molten lava to the perched pond, which allows the lava surface to rise higher than the west pit floor. If the pond rises high enough, lava can spill over the levee, forming small flows around the margin of the perched pond. Photo taken Friday, April 13, 2018 courtesy of U.S. Geological Survey

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