Fume billows from two prominent collapse pits on the west flank of
Pu`u `O`o. The upper pit, the "Great Pit," eventually engulfed
the entire slope of the cone; the lower pit overlies the episode 51
vents. The pit at the bottom of the photograph is the inactive lava pond
into which lava poured from the episode 51 and 52 vents.
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