The 684 Hakuho earthquake took place in Japan in 684, and is described in the history book Nihon Shoki from the 8th century. The earthquake took place on 26 November 684 (Julian calendar), in the 13th year of the reign of Emperor Tenmu (Tenmu period). It caused the under-sea inundation of approximately 10 km2 (3.9 sq mi) of rice fields.
HistoryLayer draws the world as it was in any year from 123,000 BCE to
2026. Move the slider and the borders redraw for that year; the map
carries 23,890 events, 12,790 people, 837 wars and 13,183 cities, each
one readable in place. Signing in is optional and lets you keep what
you find.