Abstract
The problem of tsunami warning and the use of the grid-characteristic method developed for studying wave processes in heterogeneous media is addressed. A multilayer geological model with curved boundaries and contrasting elastic parameters is considered. Various seismic survey methods, as well as different geometries of the boundaries, different values of rock densities, and various longitudinal and shear wave velocities, are examined. The boundary value problem is numerically solved jointly for the elastic and acoustic wave equations (seismic wave propagation in rocks and water layer, respectively). We use the numerical grid-characteristic method with combined structured curvilinear and regular computational grids. The wave velocity fields (velocity as derivative of displacement) and stress fields are calculated and analyzed. Synthetic seismograms are calculated for the coastal zone. It is found that some specific features of seismograms and some wave modes can be used for tsunami warning. The optimal parameters of seismic surveying are determined. Numerical simulation of wave propagation effects is used for these purposes. The proposed numerical grid-characteristic method can be used in forward numerical modeling in order to interpret seismograms recorded in the coastal zone.
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ACKNOWLEDGMENTS
This work was performed within the framework of the government-supported project “Mathematical Modeling of Dynamic Processes in Deformable and Responsive Media with the Use of Multiprocessor Computer Systems” (Section no. 0065-2019-0005, reg. no. AAAA-A19-119011590092-6) run by the Scientific Research Institute of System Analysis, Russian Academy of Sciences, under the Fundamental Research Program (no. 47 GP).
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Petrov, I.B., Favorskaya, A.V. Numerical Simulation of Seismic Wave Propagation in Coastal Zones. Dokl. Earth Sc. 497, 252–254 (2021). https://doi.org/10.1134/S1028334X21010165
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DOI: https://doi.org/10.1134/S1028334X21010165