On Thursday I went on a geology overflight to Kupaianaha and Pu`u O`o. This area of Kilauea is in its 24th year of eruption. Pu`u O`o is a parasitic cinder cone on the flank of Kilauea, and Kupaianaha is a shield that has formed 3km down from Pu`u` O`o.
The first part of the flight consisted of travelling down the path of the flows towards the current ocean entry.
This is a view to the northeast. The older flows are darker, and the younger flows are silvery.
This is the ocean entry plume shot from above. The lava is pouring into the ocean from a lava tube that is just under the hardened surface flows. The plume is poisonous sulfur dioxide gas (SO2).
Here’s a shot of the plume as we were flying away. Helicopters can induce some funky camera angles.
The helicopter dropped us off further up the flow field so that we could take some measurements. Two of my colleagues are performing Total station measurements with Pu`u O`o in the background. These measurements help us to determine how the ground around the active lava flows and lava tubes is deforming. We can measure elevation change and distances, among other things.
After we finished with the Total station, we hiked towards Pu`u O`o to map a new seep of “toothpaste” lava. This texture of lava is considered to be a transitional stage between smooth pahoehoe and rough a`a flows. We use GPS tracklogging and walk along the boundary of the seep to create the map. That’s what I’m doing here.
The lava seep is from just a few months ago, so the lava itself has an interesting array of colors and textures. There are many small vents of hot SO2 that waft up from beneath where we were standing. I was examining some of the textures and enjoying the warmth of my own volcanic sauna.
After we mapped the boundaries of the seep, we measured the thickness of the seep itself. I was holding the base of the tape measure and recording the data.
The helicopter met us after a few hours and flew us over Pu`u O`o for a look at the current eruption. For those of you waiting anxiously for the smoking cone, here you go!
Of course, this doesn’t provide a good perspective of how large Pu`u O`o really is. That’s why I’m including this image as well.
Those very small, silver dots near the rim in the foreground? Those are our measurement stations. They’re about the size of an average adult. Yes, Pu`u O`o is large. Flying over it was incredible.
I hope everyone is having a wonderfully restful long weekend!