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This video was created based on the results of investigations by the Earthquake Headquarters and other organizations. There are various theories about the location, scale, and date of past major earthquakes, and these may be revised in the future. The Nankai Trough mega-earthquake is no exception. In addition, this video divides the epicenter into four categories: "certain," "certain," "possible," and "theorized." The Nankai Trough mega-earthquake is a massive earthquake that occurs in the Nankai Trough, a plate boundary that stretches from Shizuoka Prefecture to the coast of Kyushu, and mega-earthquakes exceeding magnitude 8 frequently occur. In the worst case scenario, it is said that a mega-earthquake exceeding magnitude 9 may occur. ----------------------------------List of past massive earthquakes in the Nankai Trough: Hakuho earthquake in 684 (M 8.25) Ninna earthquake in 887 (M 8.25) Eicho earthquake in 1096 (M 8.0-8.5) Kowa earthquake in 1099 (M 8.0-8.3) Shohei Tokai earthquake in 1361 (M unknown) Shohei Nankai earthquake in 1361 (M 8.2-8.5) Meio earthquake in 1498 (M 8.2-8.4) Keicho earthquake in 1605 Hoei earthquake in 1707 (M 8.6) Ansei Tokai earthquake in 1854 (M 8.4) Ansei Nankai earthquake in 1854 (M 8.4) 1944 1946 Showa Tonankai Earthquake (M7.9) 1946 Showa Nankai Earthquake (M8.0)