The 1611 Aizu earthquake (Japanese: 会津地震) occurred on September 27, 1611, in the Aizu Basin in present-day Fukushima Prefecture, Japan. According to the official report, it was estimated that there were more than 3,700 fatalities.[1][2]Aizuwakamatsu Castle, many temples, and about 20,000 houses collapsed in the stricken areas.