Research on the historical earthquakes and tsunamis with estimation on their mechanisms by using scientific methods

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We clarify the mechanisms of the series of the gigantic Tokai-Nankai earthquakes, which occurred periodically in the intervals of about one hundred years on the boundary between the Philippine and Eurasian plates, such as the 1707 Hoei, the 1854-a Ansei Tokai, and the 1854-b Ansei Nankai Earthquakes. We also studied on the mechanisms of the inland local earthquakes, which are considered as induced earthquakes by plate boundary earthquakes, such as the 1596 Keicho Bungo, the 1828 Bunsei Echigo-Sanjo, and the 1855 Ansei Edo Earthquakes.