14 fault lines in Japan, which were thought to be ‘safe’ are now considered dangerous, potentially producing a 7.6 earthquake.

The other problem is that they all run near nuclear power plants.

A survey of the fault lines were undertaken by nuclear power plant operators, like Tokyo Electric Power Company.  They concluded that the fault lines are a real threat.

Nine fault lines are near Japan Atomic Power Company’s Tokai Number 2 power plant, and the Japan Atomic Energy Agency’s Tokai reprocessing plant in Ibaraki Prefecture.

The other five faults are near Tokyo Electric Power Company’s Fukushima Number 1 (Daiichi) and Number 2 (Daini) nuclear power plants in Fukushima Prefecture.