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20180630-usgs-lerz-03

Lava flows around islands in the lava channel. The direction of flow is from the upper right to lower left. Field crews can make a rough calculation of velocity by timing large blocks as they pass between two landmarks that are a known distance apart. Photo taken Saturday, June 30, 2018 courtesy of U.S. Geological Survey

Lava flows around islands in the lava channel. The direction of flow is from the upper right to lower left. Field crews can make a rough calculation of velocity by timing large blocks as they pass between two landmarks that are a known distance apart. Photo taken Saturday, June 30, 2018 courtesy of U.S. Geological Survey

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