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This image shows a comparison of a normal photograph (left) with a thermal image (right) of the lava delta. The cracks spanning the delta, and the warm water plumes extending out from the entry point, are evident in the thermal image. A circular area of discolored water is cool in the thermal image, and may represent a zone of upwelling of deeper water to the surface. Photos taken Monday, July 10, 2017 courtesy of USGS/HVO

This image shows a comparison of a normal photograph (left) with a thermal image (right) of the lava delta. The cracks spanning the delta, and the warm water plumes extending out from the entry point, are evident in the thermal image. A circular area of discolored water is cool in the thermal image, and may represent a zone of upwelling of deeper water to the surface. Photos taken Monday, July 10, 2017 courtesy of USGS/HVO

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