Japan’s Deadliest Fault Line Shifts, Frustrating Megaquake Forecasts The Nankai Trough, a 560 mile stretch of fault line off Japan's Pacific coast, has long been considered one of the most seismically active regions on Earth.
For decades, scientists have warned that it's only a matter of time before a megaquake strikes, unleashing devastating tremors and tsunamis upon the country.
A recent study published by the University of Tokyo's Institute of Industrial Science and the Japanese coastguard has challenged these predictions.