Numerical Simulation of Seismic Wave Propagation in Coastal Zones

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 di...

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Bibliographic Details
Published in:Doklady earth sciences 2021-03, Vol.497 (1), p.252-254
Main Authors: Petrov, I. B., Favorskaya, A. V.
Format: Article
Language:English
Subjects:
Acoustic propagation
Acoustic wave propagation
Acoustic waves
Boundaries
Boundary value problems
Coastal zone
Coastal zones
Computational grids
Computer applications
Earth and Environmental Science
Earth Sciences
Emergency warning programs
Fields
Geophysics
Mathematical models
Multilayers
Numerical analysis
Numerical simulations
P-waves
Parameters
Propagation
Rocks
S waves
Seismic activity
Seismic propagation
Seismic prospecting
Seismic surveys
Seismic velocities
Seismic wave propagation
Seismic waves
Seismograms
Shear wave velocities
Simulation
Stress distribution
Surveying
Tsunamis
Velocity
Velocity distribution
Wave equations
Wave propagation
Wave velocity
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Summary: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.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X21010165