Aerial view looking southwestward shows the active vent within Pu`u `O`o
crater. Lava often poured from the vent across the sloping crater
floor and drained into the pit at the opposite (downrift) end of the crater. Several
times in 1997, lava filled the crater and spilled over the east rim,
draping the east flank of the cone with bright
silver pahoehoe (lower left).
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