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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Posted on June 25, 2016.
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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