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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Posted on August 19, 2016.
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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