Diffracted Seismic waves near the PKP Caustic
نویسندگان
چکیده
منابع مشابه
Diffracted and Head Waves Associated With Waves on Nonseparable Surfaces
A theory is presented for computing waves radiated from waves on a smooth surface. With the assumption that attenuation of the surface wave is due only to radiation and not to dissipation in the surface material, the radiation coe cient is derived in terms of the attenuation factor. The excitation coe cient is determined by the reciprocity condition. Formulas for the shape and the spreading of ...
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We propose a method for analyzing both theoretically and experimentally the behavior of the phase of the waves diffracted by gratings. The method is applied to the study of resonance phenomena. It is used for determining the optogeometrical parameters of a metallic grating. We show that the experimental setup, which is insensitive to mechanical drifts or thermal fluctuations, can be used for se...
متن کاملDiffracted and Head Waves Associated With Waves on . . .
A theory is presented for computing waves radiated from waves on a smooth surface. With the assumption that attenuation of the surface wave is due only to radiation and not to dissipation in the surface material, the radiation coe cient is derived in terms of the attenuation factor. The excitation coe cient is determined by the reciprocity condition. Formulas for the shape and the spreading of ...
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Waves propagating in a medium with highly variable refractive index tend to focus forming caustics. The energy content of the waveeeld in the vicinity of a caustic is higher than that of the ambient eld away from the caustic. Consequently, waves scattering from heterogeneities located near caustics have more energy than a eld scattering a little further away from the caustic. For a suitable cho...
متن کاملFictitious diffracted waves in the diffraction theory of Kirchhoff.
The diffraction theory of Kirchhoff is applied to the semi-infinite aperture of a black half-screen. The derivative of the spherical Green's function is taken into account without any approximation. The uniformly evaluated scattering integral is compared with the physical optics solution. It is shown that the non-omitted term causes the existence of fictitious diffracted waves.
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ژورنال
عنوان ژورنال: Geophysical Journal International
سال: 1958
ISSN: 0956-540X,1365-246X
DOI: 10.1111/j.1365-246x.1958.tb00030.x