Abstract
Earthquake occurrence probabilities are estimated with the Gutenberg and Richter relation for 5 regions in and around Japanese archipelago. We devided the Japanese islands into 5 regions considering geotopography, geology and plate boundaries to apply the Gutenberg and Richter formula and to estimate the earthquake occurrence probability. As a result, an earthquake with M=7.5 in the eastern margin area of the Japan Sea has a return period of 284 years. The tsunami magnitudes also were estimated from tsunami run-up heights of historical tsunamis by using the Abe's relation. A tsunami generated in 1741, in Kanpo Era, found to be the tsunami magnitude Mt=8.4, and the largest tsunami of the Japan Sea.
