Numerical simulation of tsunami wave height distribution for Turkish Black Sea coast in nonlinear dynamic keyboard model of underwater seismic source

In frames of nonlinear shallow water equations taking into account dissipative effects and bottom friction a numerical simulation of a possible catastrophic tsunami in the Black Sea basin is performed. The computation was performed for seismic sources with various locations in the south-eastern and north-western parts of the Black Sea basin. The location of model sources was selected taking into account more seismoactive zones and proposed recurrence periods of tsunamis for a given region. A seismic source was constructed in frames of a keyboard model of the earthquake source taking into account possible temporal and velocity characteristics of seismic processes in a concrete source. Using a keyboard model of the source, both kinematic and dynamic models of earthquake sources were considered. The keyboard model of an earthquake source with different-time motions of keyboard blocks permits considering various scenarios of processes possible at earthquakes in seismic sources and estimating the influence of these processes on the distribution of maximum wave heights along the coast. Two scenarios for each seismic source were considered: a dynamical model, when the source is divided into keyboard blocks which are shifted in the vertical direction for different times and a single block moving according to certain laws describing unloading in the seismic source on the realization of an earthquake. For each of the scenarios considered, wave characteristics were obtained and a spectral analysis was performed which permits clearing the most dangerous places of the coast for moderate or strong tsunamigenic earthquakes.