The Hawaiian Volcano Observatory provides us with excellent pictures of the crater of Pu'u O'o.
The internal and deep crater that was formed in mid 2014, following the opening of the vent "says of June 27", and the small pit crater located to the west, has a reduced fumerolienne activity which allows to observe the crater floor.
The remains of the original cone of Pu'u O'o, formed in the mid 1980s, are visible only the foreground - paler area - and in the background, behind the fumaroles - most brownish raised area.
On 19 and 20 January, the Observatory reports a visible glow in the crater and on the upper side of the NE cone. A small lava lake in the pit crater located west, wide of twenty meters, present glow ... witnessed the continuous activity within these vents.
Seismic activity remains low, as the sulfur dioxide emissions across the East Rift Zone. The tiltmeter, placed on the cone, does not register significant changes, despite an inflationary trend since early January.
Pu'u O'o crater: the small crater-well (pit crater) located west side, and right, sulfur deposits on the floor (close up below) and cameras of the HVO height on the crater rim - photo HVO / USGS 01/19/2016
Crack on the floor of the crater of Pu'u O'o, colored by sulfur deposits - photo HVO / USGS 01/19/2016
Source: HVO - Hawaiian Volcano Observatory