ASSESSMENT OF TSUNAMI HAZARD FOR THE COAST OF THE BAY OF KORF (BERING SEA) ACCORDING TO THE RESULTS OF NUMERICAL MODELING

The paper discusses the results of solving the problem of assessing the tsunami hazard of a section of the north-eastern coast of Kamchatka in the area of the Korf village, located on a sandy spit in the northern part of the Korf bay of the same name. To obtain these estimates, the "worst case" methodology was used. Based on the results of an analysis of seismicity and historical data on tsunami manifestations in the western part of the Bering Sea, three tsunamigenic zones were identified — near-field (Bering Sea), regional (Western Aleutians) and far-filed (Southern Chile), which create the greatest tsunami threat for the study area (north-eastern coast of Kamchatka) Based on the results of the analysis of seismicity and tectonic features of the source zones, sets of model tsunamigenic earthquakes typical for each of them were determined. For this set of models, numerical modeling of tsunami generation and propagation was performed and the most dangerous model sources were identified. The maximum elevations created by these sources for the Korf village area were 1.3 m for sources in the near (Bering Sea) zone, 2.4 m for the regional (Aleutian) zone, and 2.5 m for the far (Chilean) zone. At the next stage, for these sources, more detailed calculations were carried out on sequences of nested computational grids, which determined the characteristics of the tsunami impact on the coast. The main results of the work are the identification of the most dangerous tsunamigenic zones in relation to the Korf Spit, the selection of model sources for them and assessments of extreme impacts of tsunami waves that threaten this section of the coast.