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A collapse of a thin portion of the roof over the lava tube reveals the lava stream beneath the surface. The fluid stream is the bright orange color, with the dark orange area to the left representing the hot, incandescent tube wall. The lava stream today was relatively slow moving in the tube, perhaps reflecting a low rate of lava supply to the flow front.
For a brief period this afternoon a vigorously spattering vent at the east end of Pu‘u ‘Ō‘ō crater fed a swiftly moving river of lava that cascaded into the deeper portions of the crater. The cascade was over within about ten minutes of this photograph, but the vent continued to spatter.