By Frederic L. Lizzi, D. Jackson Coleman, Jack Driller (auth.), A. J. Berkhout, J. Ridder, L. F. van der Wal (eds.)
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O. Box 350 Blindern, 0314 Oslo 3, Norway ABSTRACT It is known that diffraction gives rise to dispersive effects on the seismic signal (Trorey, 1977). To examine these effects, we have developed a computer program that includes diffraction in the simulation of acoustic pulse propagation in complex 3D media (Sandvin, Pedersen, Gj~ystdal, 1984). The programs are based on a generalized Kirchhoff approximation of the diffraction integral for inhomogeneous media. The approximation utilizes a dynamic ray tracing solution both for the Green's function and the boundary values in the Kirchhoff integral.
S 06 Fig. I: The effect on a monitor record of decreasing source mass. Effect of Dynamite Charge Size on Earth Response Whenever measurements are made to test the seismic response of the earth as a function of the mass of the dynamite used, it is always found that the response depends on the mass in a nonlinear way. Figure 1 reproduced from Ziolkowski and Lerwill (1979) illustrates this point. 44 We see four shot records from a spread of S geophones spaced at 12 m intervals, from four charges fired separately in holes 7 m deep offset 60 m from the nearest geophone.
25. A. , "Experimental, Ultrasonically Induced Lesions in the Retina, Choroid and Sclera," Invest. , 17:350-360, 1978. A. , "Effects of Pulsed Ultrasound on Ocular Tissue," Ultrasound in Medicine and Biology, 7:245-252, 1981. , Driller, J. , "Ultrasonically Accelerated Resorption of Vitreous Membranes," Amer. J. , 89, 490-499, 1980. , "Therapeutic Ultrasound in the Treatment of Glaucoma, Part I: Experimental Model," Ophthalmology, 92:339-346, 1985. , "Therapeutic Ultrasound in the Treatment of Glaucoma, Part II: Clinical Applications," Ophthalmology, 92:347-353, 1985.