lava pond at the NE spatter cone in Pu‘u ‘Ō‘ō. The pond is about 1...

A closer view of the lava pond at the northeast spatter cone in Pu‘u ‘Ō‘ō crater. The pond is about 10 m (about 30 ft) wide, and was undergoing cycles of gas pistoning. The lava level would slowly and quietly rise a meter (yard) or more over about five minutes, and vigorous spattering would commence. As the gas was released, the lava level would drop to its previous level and the cycle would begin again.