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20170720-usgs-halemaumau-05

Crustal foundering, in which pieces of the thin, flexible lake crust sink beneath the surface, is common in the southern portion of the lake. Photo taken Thursday, July 20, 2017 courtesy of USGS/HVO

Crustal foundering, in which pieces of the thin, flexible lake crust sink beneath the surface, is common in the southern portion of the lake. Photo taken Thursday, July 20, 2017 courtesy of USGS/HVO

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