Blue pond in Hokkaido(JP037)

" Blue pond " which was adopted in wallpaper MacBook Pro Apple's 2012 , became a hot place
Tokachi is after the eruption in December 1988 , to protect the Biei town from volcanic disaster , as the facility to save the volcanic mud flow , due to concrete blocks that can be the completion of the construction work early , Hokkaido Regional Development Bureau Heisei first year for Tsutsumi is launched in June , completed in December of the same year , as a result , water accumulates in Tsutsumi block , somewhere down the line , I came to be called " blue pond " .
It's looks blue like in the pictures , this water either from a " waterfall of white beard " that gush in platinum hot-spring area , flowing water that contains aluminum , colloid that are invisible to the naked eye when mixed with water Bieigawa but it will be created.
Because the light from the sun collide with the colloidal particles in the water , is scattered in various directions , colloidal particles , prompting the scattering of light , blue light having a short wavelength is likely to be scattered , the light arrives in our eyes , it is said that it looks blue .
However , for the cause that looks blue is water , water quality survey has been in the past , but it is not been elucidated for a clear cause . Tokachidake after the eruption , as birch that was native , is a mysterious place of birth from the natural phenomena that were produced unexpectedly .
Now , since the landscape trees such as larch is not withered up in a blue pond looks fantastic , it is the spot that became popular in the spread Reviews from photographer etc. .