Which 1611 earthquake and tsunami devastated the northeastern Japanese region of Sanriku?

The Keichō Sanriku earthquake devastated Japan’s northeastern Sanriku region in 1611.

The earthquake occurred on 2 December 1611, followed by a destructive tsunami along the Pacific coast of Tōhoku. Historical records describe severe effects in the Sanriku area, including coastal flooding and major loss of life. The event is commonly classified as a megathrust earthquake, although the exact source and magnitude remain subjects of scientific study.

The disaster happened during the early Tokugawa period, when Japan’s political order was still being consolidated after the Battle of Sekigahara and the Osaka campaigns. It is not the same event as the much later 1896 Sanriku tsunami or the 2011 Tōhoku earthquake and tsunami. The shared regional name can cause confusion, especially because Sanriku has repeatedly experienced tsunami disasters due to its deeply indented coastline.