Mt Fuji has been thought to contain two old volcanoes inside its splendid cone shape, but the results of three years of research suggest the existence of another volcano deep within it.
... Previously, researchers believed the 3,776-metre mountain took its shape through three major volcanic activities that started several hundred thousand years ago.
The volcano created in the first major eruptions is called Komitake, which is believed to have been around 2,500 metres high.
The second major eruptions occurred about 100,000 years ago, which eventually led to the formation of the volcano known as Old Fuji. Komitake is inside Old Fuji.
The last major eruptions took place around 10,000 years ago. As a result, New Fuji, or the current Mt Fuji, was formed over Old Fuji.
But researchers at the institute say that when they conducted drilling into the depths of the mountain, they found andesite, a type of rock that has never been discovered at the mountain ... Komitake and Old Fuji are composed of basalt ...
The ... andesite is located beneath Komitake, which suggests that a different volcanic activity took place prior to the formation of Komitake ...-- Kyodo
I knew that wily Fujisan was hiding something.
