NUMERICAL ANALYSIS OF THE PLANE WAVES SCATTERING BY SEMI-SPHERICAL ALLUVIAL VALLEY

Abstract eng:
One of the major concerns of engineering seismology is to understand and explain vibration properties of the soil excited by near earthquakes. Alluvial deposits, often very irregular geometrically, may affect significantly the amplitudes of incident seismic waves. A numerical method is presented for scattering and diffraction of plane waves( SH,P and SV) of arbitrary angle of incidence from three-dimensional complicated topography in this study. The wave input is realized through the free field wave motion obtained by Thomson-Haskell transfer matrix method. The wave motions are calculated by the method of lumped-mass explicit finite element and local transmitting artificial boundary condition. The method is applied to the analytically solved case of semi-spherical alluvial valley on homogenous elastic half space to verify its accuracy.

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