68 km S of Shing?, Japan

A magnitude 8.3 earthquake — a great event — struck near 68 km S of Shing?, Japan on December 20, 1946, at a shallow depth of about 15 km. An earthquake this size would have been felt strongly across the surrounding region; shallow earthquakes release their energy close to the surface, so they tend to cause the strongest shaking and the most damage. Shallow magnitude 8.3 events near a coastline can also pose a tsunami risk. Casualties, damage and the recovery depend on local building standards, population and distance from the epicentre — the news coverage, references and photos below capture what happened on the ground.