Skip to comments.Geology Picture of the Week, June 18-24, 2006: Kilauea Vent and Sand Boil Challenge
Posted on 06/21/2006 1:38:28 PM PDT by cogitator
Active lava pond in the East Pond Vent, Pu'u O'o, Kilauea, Hawaii:
CHALLENGE: Find a good picture of a freshwater spring sand boil. This is where the water of a spring is emerging from a sandy bottom, and the sand "boils" where the water flow is strongest. Example:
The white area is a sand boil in a Florida freshwater spring. What I need is a high-quality close-up example of this for a demonstration. (Not critical, but it would be helpful.)
** ping **
There is a wonderful little spring with a sand boil under only 3 or 4 inches of water near Peterborough Ontario. Any Freepers in the area?
Will keep looking....
There is a small approximately 24" dia sand boil on the northern end of Cumberland islandNational Sea Shore.
It doesn't have a pond above it. If you put your hand in slowly it will penetrate but if you hit with your fist it will resist.
It is near Mount Cumberland Isalnd.... elevation 35 feet.
There are several nice sand boils in the Juniper Springs area in the Ocala NF, Florida. The Rainbow River has a couple on the side of the main spring. They are now off limits. Google these to see if anyone has posted a pic.
There are images of sand boils from the November 2002 mag 7.3 quake along the Denali Fault at the U. of Alaska Fairbanks Seismology website here:
Sand boils created in the January 6, 2001 Bhuj, India earthquake (moment magnitude 7.6).
Such features are caused by soil losing its internal cohesion (friction between soil particles) during the strong shaking of a large earthquake, a process called liquefaction. During liquefaction, the soil settles (consolidates), and extracted water may be forced to the surface. In sand boils, expelled water caries sand particles with it to the surface through volcano-like vents that may cover large areas with sand (sand boils are also called sand volcanoes). Liquefaction can also cause foundation failure during earthquakes as soil consolidates, and is a serious hazard in seismic regions with sandy or other porous soils. Ancient sand boil features, for example in exposed channel banks of the Pacific Northwest, are indicators of prehistoric strong shaking. Before sand boils were understood, some fossil examples were conjectured to be preserved animals burrows! The largest of the Bhuj boils shown is approximately 2 m in diameter.
[ Photo by C.P. Rajendran; reproduced from the cover of Seismological Research Letters, July/August, 2002.]
For more information: Soil Liquefaction Web Site at the University of Washington
Check out the pic in lower right side
This is the sand boil area at Juniper Springs
For others to see, I linked the page below.
We used to play in these springs 45 years ago before they closed it off. I remember my body bubbling up and down with the water pressure and feeling like I was on some kind of foamy material. I was a kid of 8 at the time. We sometimes felt that it might pull us under but it never did. There were alligators nearby too that gave us a challenge.