Attenuation of short period seismic waves due to scattering. Geophysical Journal International, 171, 865. Numerical simulation of wave propagation in fractured media: scattering attenuation at different stages of the growth of a fracture population. Geophysical Journal International, 152, 649. Numerical simulation of wave propagation in media with discrete distributions of fractures: effects of fracture sizes and spatial distributions.
Bulletin of the Seismological Society of America, 81, 2234. Diffraction of P, SV, and Rayleigh waves by topographic features: a boundary integral formulation. Topographic effects for incident P, SV, and Rayleigh waves. Geophysical Journal International, 135, 289. Numerical modelling of seismic waves scattered by hydrofractures: application of the indirect boundary element method. Diffraction of seismic waves by cracks with application to hydraulic fracturing. Journal of Computational Acoustics, 9, 1039. Numerical study of elastic wave scattering by distributed cracks or cavities using the boundary integral method. Larose, E., Margerin, L., van Tiggelen, B.
Journal of the Optical Society of America, 52, 116. Geophysical Journal International, 66, 221. The use of the Born approximation in seismic scattering problems. Bulletin of the Seismological Society of America, 68, 573.
#DIFFRACTION DEFINITION SCIENCE WAVES CRACK#
Numerical study of diffraction of plane elastic waves by a finite crack with application to location of a magma lens. Geophysical Journal International, 103, 111.įehler, M., and Aki, K., 1978. The effect on teleseismic P of the zone of damage created by an explosion. Journal of Geophysical Research, 94, 17805.ĭouglas, A., and Hudson, J. Numerical study of the diffraction of elastic waves by fluid-filled cracks. Finite-difference modelling of faults and fractures. The Journal of the Acoustical Society of America, 81, 1671.Ĭoates, R. Diffraction of elastic waves by cracks or cavities using the discrete wave-number method. London: Pitman Learning.īouchon, M., 1987. Ray Methods for Waves in Elastic Solids, with Application to Scattering by Cracks. than those of short wave or VHF radio, or television.Achenbach, J. Long wave radio signals are much less affected by buildings, hills, tunnels etc. The greater the wavelength, the greater the diffraction.ĭiffraction affects radio and television signals. The extent of the diffraction also depends on the wavelength of the waves. Waves passing through a wide gap (gap width greater than the wavelength) Waves passing through a narrow gap (gap width less than the wavelength)Ī gap width much larger than the wavelength causes little spreading eg light waves passing through a doorway. The wavelength is unchanged after diffraction.Ī gap width similar to the wavelength of the waves passing through causes a lot of spreading, eg sound waves passing through a doorway. The extent of the spreading (diffraction) depends on how the width of the gap compares to the wavelength of the waves. This is diffraction - the spreading out of waves when they go through a gap, or past the edge of a barrier. The waves always 'spread' to some extent into the area beyond the gap. This may seem obvious but what happens on the far side of the gap or barrier is not so straightforward. When waves meet a gap or an edge in a barrier, they continue through the gap or past the edge of the barrier.
0 kommentar(er)
