Aerial view of the perched lava lake in Pu`u `Ō `ō crater. Aerial view of the perched lava lake in Pu`u `Ō `ō crater. Small fluctuations in the lava lake level lead to frequent overflows. These serve to build the levee around the lake even higher, amplifying the perched appearance.
Hawaiian Volcano Observatery USGS
2011-05-27
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