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20160325-usgs-puuoo-geologist

HVO geologists walk along the edge of the inner crater in Puʻu ʻŌʻō, making stops periodically to perform laser rangefinder measurements of crater dimensions. Photo taken Saturday, March 25, 2016 courtesy of USGS/HVO

HVO geologists walk along the edge of the inner crater in Puʻu ʻŌʻō, making stops periodically to perform laser rangefinder measurements of crater dimensions. Photo taken Saturday, March 25, 2016 courtesy of USGS/HVO

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