Meiō
20 September 1498 (Meiō 7, 2nd day of the 7th month): Earthquake in the Enshunada Sea (Latitude: 34.000/Longitude: 138.100), 8.6 on the Richter Scale; and also on that same day, another earthquake in Nankaido (Latitude: 33.500/Longitude: 135.200), 7.5 on the Richter Scale.