Magnitude 6.9 quake hits northern Japan, no tsunami warning

A powerful magnitude 6.9 earthquake jolted northern Japan, shaking homes and disrupting bullet train services. While felt as far as Tokyo, authorities reported no casualties or tsunami threats. The quake, striking off Iwate prefecture, registered a strong intensity in Aomori. Japan, situated on the Pacific "Ring of Fire," experiences frequent seismic activity, a reminder of past devastating quakes.