Halemaumau and Puu Oo Crater (3/8/14) - lanikai-beach.net

Kīlauea’s summit lava lake in Halemaʻumaʻu . A persistent spatter source is active on the lake margin and lava pond in Puʻu ʻŌʻō crater, which was undergoing “gas pistoning”. Gas pistoning is the cyclic rise and fall of the lava surface, driven by the buildup and release of gas in the lava pond. This sequence shows the drop of the lava level, which corresponds with vigorous spattering and agitation of the pond surface. Video courtesy of USGS/HVO

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