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20160819-usgs-lavaflow-61g-01

HVO geologist conducts 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 Friday, August 19, 2016 courtesy of USGS/HVO

HVO geologist conducts 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 Friday, August 19, 2016 courtesy of USGS/HVO

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