869 Jōgan earthquake, Historical earthquake in Japan
The 869 Jōgan earthquake triggered a major tsunami off the coast of Sanriku, Japan.
Occurred in July 869 AD during the Heian period in Mutsu Province.
Highlighted in Japanese literature and historical records.
Helps modern scientists understand earthquake and tsunami risks.
One of the earliest events supporting the recurrence of large magnitude earthquakes in the area.
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