Hawaii Kilauea Volcano Drainhole Gas Pistons Daytime USGS

http://www.FunToWatch.TV A very interesting phenomenon seen at Kilauea is "gas pistoning". It is caused by the accumulation of gas beneath a column of lava, such as in Pu`u `O`o's crater vents. As the accumulated gas rises, it pushes up the overlying lava (the "piston"). When the gas bubble reaches the surface, it bursts, sometimes as a forceful jet of fume and spatter. The lava then drains back into the vent. Gas pistons come in a range of sizes, dependent on the size of the gas bubble, and can occur as single events or as a repeating series of events. During late Spring of 2006, the Drainhole vent in Pu`u `O`o crater was hosting nearly continuously repeating gas pistons. This movie sequence from June 3, showing a series of three gas pistons, is a brief example of the gas pistoning that was occurring at that time. The vent opening seen here is about 8 meters across, and is inset within the greater Drainhole pit which is about 30 to 40 meters across.
June 3, 2006 10:45:03 to 12:20:03
(1 hours 35 minutes and 0 seconds -- 1 frame per minute)
Video Credit: U.S. Geological Survey Department of the Interior/USGS

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