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Webcam Captures “Bathtub Ring” Falling Into Lava Lake

This sequence of HVO webcam images of Kīlauea Volcano’s summit vent, recorded between 1:28 and 1:32 p.m., HST, on May 12, 2015, captures the moment a section of the dark-colored “bathtub ring” (a veneer of fresh lava that coats the vent wall as the lava lake level drops) fell into the lava lake (center).

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Click to enlarge

The lava veneer collapse, which produced a visible cloud of rock and lava fragments, agitated the lava lake surface and exposed lighter-colored layers of older rock in the vent wall (right).