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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).

Click to enlarge

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).