Tubes and Craters and Cones -- OH MY!!

Real place, real people, but photoshoped artistry

The District of Puna (where we live on the Big Island) is riddled with volcanic features and activity. If you are a regular blog follower, you’ve already read several entries about Kilauea’s Pu’u O’o vent, flowing continuously for over 30 years. But flowing lava is just part of the volcanic story. ("click" on any image for bigger view.)

For example, the entire district has massive, hollow, miles-long lava tubes running underground. Access to these happens when a layer collapses forming a puka (hole) in the surface. They may be great for spelunkers but are not so great for stray pets…some return, but some never find their way back home. Our friends across the street had a puka so large they had to put a chain link fence around it to keep their dogs safe!

Map shows our house and our two friends houses (notice Geothermal Plant -- on the edge of another big crater

A recent Easter Party with friends prompted this blog entry and a little talk-story about craters within walking distance from us. Although there are many such, we are talking about three that are about 2-3 miles from our house in Leilani Estates Subdivision. Our friends live about a mile due east from us where the yard in front of their house features a currently operating steam vent. We joke that at least they have the option of building a sweat lodge or a unit that will produce poached eggs. If you look at the map you can see there are craters directly behind them.

Google Earth closer up - our house on left - friends' houses closer to craters

Another friend, another mile east, actually built his house on the edge of a crater. We have visited his house and walked along the edge of this crater, which at its widest is about 100 m. Scientists believe that this crater, called Pu`ulena Crater (Yellow Hill,) was formed by the collapse of a series of three smaller pit craters with steam-driven explosive eruptions that blanketed the area with rock debris as thick as 20 m.

As the two craters on either end of Pu’ulena are Kahuwai (Water Master) and Pawai (Water Container) it is further thought that an explosive eruption probably took place when ascending magma encountered perched groundwater or a hydrothermal reservoir. After this event the ground may have collapsed due to the subsequent withdrawal of magma forming what is now an elongated crater. This explosive activity occurred 450-700 years ago. (Above info gleaned from variety of sources including: USGS, Hawaii Dept of Land and Natural Resources, Hawaii Volcano HVO Hawaii Volcano Observatory, Google Earth.