USGS / HAWAIIAN VOLCANO OBSERVATORY

This view of Puu Oo is to the southwest. In the foreground, the circular lava pond that was active in July 2014 is visible. The lava tube feeding the active flows on the June 27th lava flow is evident by the line of white fume sources extending off the right side of the photograph.

USGS / HAWAIIAN VOLCANO OBSERVATORY

A hornito recently formed over the lava tube on the north flank of Puu Oo, at the spot of the breakout that occurred Nov. 25.

USGS / HAWAIIAN VOLCANO OBSERVATORY

A Hawaiian Volcano Observatory geologist collects spatter deposited around the base of the hornito for geochemical analysis.

USGS / HAWAIIAN VOLCANO OBSERVATORY

This photograph was taken from the western pit at Puu Oo, and shows the small lava pond (roughly 66 feet in diameter) contained within the pit.

USGS / HAWAIIAN VOLCANO OBSERVATORY

This view of Puu Oo is looking northwest. The inner, deeper crater formed in mid-2014 following the opening of the June 27th vent, and occasional small flows on the crater floor are evident by their dark color. The smaller, circular pit in the west portion of the crater has contained a small, active lava pond in recent months.

USGS / HAWAIIAN VOLCANO OBSERVATORY

Colorful sulfur deposits formed recently around one of the cracks on the floor of Puu Oo Crater.