December 31, 1703 - Genroku

    The Genroku Earthquake is thought to have been an interplate earthquake whose focal region extended from Sagami Bay to the tip of the Boso Peninsula as well as the area along the Sagami Trough in the open sea southeast of the Boso Peninsula.  It generated strong ground motion over a wide area centered in the southern Kanto region.  Reports on the damage theorized that ground motion corresponded to a seismic intensity of 6 on the Richter scale.  This earthquake then resulted in a tsunami that hit the coastal areas of Japan and the Boso Peninsula.  The tsunami caused more than 6,500 fatalities on the peninsula. In Awa, Japan, however, the tsunami was reported to have killed more than 100,000 people - possibly the most destructive tsunami ever.

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