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20160623-usgs-lavaflow-s-03

HVO geologists conduct a VLF (very low frequency) survey across the episode 61g lava tube to measure the depth and cross-sectional area of lava flowing within the tube. Photo taken Thursday, June 23, 2016 courtesy of USGS/HVO

HVO geologists conduct a VLF (very low frequency) survey across the episode 61g lava tube to measure the depth and cross-sectional area of lava flowing within the tube. Photo taken Thursday, June 23, 2016 courtesy of USGS/HVO

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