Japanese scientists predict Mt. Fuji will blow due to new tectonic pressures that are higher than when the volcano last erupted more than 300 years ago. Estimates say the eruption will affect more than 400,000 people and cost over $30 billion.

The National Research Institute for Earth Science and Disaster Prevention has issued a warning that Japan’s 9.0 magnitude undersea quake last year, plus an aftershock four days later near Mt. Fuji, has created large pressure on the volcano’s magma chamber, which could lead to an eruption.

Mt. Fuji has already been classified as an active volcano, but scientists revealed new readings that show that the current pressure is at 1.6 megapascals, nearly 16 times higher than that required to trigger an eruption (0.1 megapascals).

It is "not a small figure", Kyodo News quotes lead volcanologist on the case as saying.

However, no signs of an eruption have so far been detected.

http://rt.com/news/fuji-volcano-eruption-japan-564/