The probability of a megaquake occurring in the Nankai Trough within the next 30 years has been revised from 80 per cent to a range of around 60 to 90 per cent, or higher, Japan’s earthquake investigation panel has said.The revision reflects a new calculation method that takes into account data errors and uncertainties in predictions, and does not mean that the risk of an earthquake has increased, according to the government panel.“The situation remains that an earthquake could occur at any...