Japan issued a megaquake advisory on Tuesday after a magnitude 7.5 earthquake struck off the eastern coast of Aomori, the northernmost prefecture of Japan’s main island of Honshu, and just south of the northern island of Hokkaido. Damage from this quake was modest – 34 mostly mild injuries and some damage to roads and buildings.Officials said the advisory was not a prediction and the probability of a magnitude 8 or larger quake is only about 1 per cent. But there’s hope the advisory will serve...