The active surface flow from Puʻu ʻŌʻō is still advancing slowly downslope and was 4.4 km (2.7 miles) long when mapped today. Averaged over the past six days, the flow has been advancing at a rate of about 200 m (220 yards) per day.
At that rate, it will take about 10 days to reach the top of Pūlama pali, which is in the middle distance about 2 km (1.2 miles) farther downslope.
The uppermost part of the nascent lava tube has several skylights, which reveal the lava stream within the flow, like capillaries beneath the skin
Several vents have opened on Puʻu ʻŌʻō’s northeast flank since last December. A spatter cone grew over one of the vents in mid-May and is visible at the center of the photo emitting bluish fume. In recent weeks, a vent opened upslope from (to the left of) the spatter cone, revealing bright incandescence.
Though difficult to photograph, aerial views showed that this open vent was but a small window into a large, hot cavity beneath Puʻu ʻŌʻō’s northeast flank. Inside, streams of lava from an unseen source (or sources) closer to the crater rim (visible at lower right) were cascading toward the upper left into unknown depths.