EVALUATION OF TSUNAMI HAZARDS FROM JAPAN-MARITIME EARTHQUAKES USING NUMERICAL MODELING OF TSUNAMI

This paper addresses the issue of improving the tsunami warning system in the Far East of Russia. The authors carried out a detailed analysis of geographical magnitude criterion for tsunami hazard in the Sea of Japan to announce tsunami alerts in the Far East of Russia. At the same time, the authors analyzed the dependence of the tsunami hazard of underwater earthquakes in the Sea of Japan on the magnitude and coordinates of the source. To identify this relationship, numerical tsunami modeling was used with application of a model source, based on Okada's formulas. A series of computational experiments were carried out, while model tsunami sources were located in the seismically active zone of the Sea of Japan. Based on the analysis of the results of computational experiments, an area with an increased threshold magnitude was proposed by the authors to be selected in the Sea of Japan. The implementation of this proposal will increase the effectiveness of the Tsunami Warning Service in the Far East of Russia, by reducing the number of false alarms.