High-performance computer simulation of wave processes in geological media in seismic exploration |
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Authors: | I E Kvasov I B Petrov |
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Institution: | 1.Moscow Institute of Physics and Technology,Dolgoprudnyi, Moscow oblast,Russia |
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Abstract: | A class of problems arising in seismic exploration are investigated, namely, seismic signal propagation in multilayered geological
rock and near-surface disturbance propagation in massive rock with heterogeneities, such as empty or filled fractures and
cavities. Numerical solutions are obtained for wave propagation in such highly heterogeneous media, including those taking
into account the plastic properties of the rock, which can be manifested near a seismic gap or a wellbore. All types of explosion-generated
elastic and elastoplastic waves and waves reflected from fractures and the boundaries of the integration domain are analyzed.
The identification of waves in seismograms recorded with near-surface receivers is addressed. The grid-characteristic method
is used on triangular, parallelepipedal, and tetrahedral meshes with boundary conditions set on the rock-fracture interface
and on free surfaces in explicit form. The numerical method proposed is suitable for the study of the interaction between
seismic waves and heterogeneous inclusions, since it ensures the most correct design of computational algorithms on the boundaries
of the integration domain and at media interfaces. A parallel software code implemented with the help of OpenMP and MPI was
used to execute computations on parallelepipedal and tetrahedral grids. |
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