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18th International Conference on Geoinformatics - Theoretical and Applied Aspects
- Conference date: May 13-16, 2019
- Location: Kyiv, Ukraine
- Published: 15 May 2019
141 - 142 of 142 results
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Neural network model field of the time of the first entrances of seismic waves of Ukraine
Authors O. Herasymenko, M. Lazarenko, N. Ostapchuk and L. ShumlianskaSummaryIt is proposed to use the seismic data of the DSS on the territory of Ukraine to build neural network models of the seismic signal arrival times field, which allows the construction of longitudinal wave hodographs along arbitrarily oriented profiles in regions where do not have seismic observations. Also this possible use to correct the velocity section using one from methods of the inversion of hodograph. A comparison is made of simulated arrival times of longitudinal waves with those that were recorded on the territory of Ukraine. Parallels have been made between the modeling of the time field from meridional and latitudinal sources with the propagation of stresses, which external indenters create on the territory of Ukraine. At the same time, regional fault zones were reflected in the residuals of the time field. This shows that the artificial field of time, modeled by the neural network, is reflected in the real tectonic division of the territory of Ukraine.
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Modelling of nonlinear waves propagation in the block structured Earth's lithosphere
Authors D. B. Vengrovich, I. V. Belinskii and V.A. LemeshkoSummaryThe report contains formulation of the problem and experimental modelling results on propagation of nonlinear pulses in Earth's lithosphere. We consider the lithosphere from the point of view of the dynamics of model structured media. In One-dimensional representation we use for this purpose the chain of steel balls with the same diameter of 41.25 mm. The wave-pulse perturbation in the model is generated by the different speeds impact of one steel ball on the rest of the chain of balls. The Strike ball is mounted on the pendulum mechanism console and the impact force depends on the angle of deflection of the pendulum. It is known that during the propagation of such a shock pulse along chain it is transformed into a soliton-like pulse (compacton) after 4 elements of the model. We assume that such nonlinear solitary waves can be generated directly in the earthquake sources. Then they are transformed into seismic waves, spreading from the epicenter. The goal of the research is to test the hypothesis of the transformation of this nonlinear solitary wave into a seismic wave in cases of using in the structured lithosphere modeling more realistic medium models as opposed to the ideal chains of spherical granules. For this purpose, part of the chain is filled up with sand to simulate a medium that absorbs part of the nonlinear perturbation energy in the chain of granules. The use of special piezoelectric sensors and a dual-channel oscilloscope TDS-210 allowed us to study the spread of nonlinear wave in the model. We have made a parallel physical experiment and numerical modeling for verification of results.
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