Seismic response of two-dimensional absorbing structures by the ray method

Main Article Content

P. Moczo
P.-Y. Bard
I. Pšenčik

Abstract

A method of seismic response analysis of 2 — D inhomogeneous structures, based on the ray method and on the application of the Debye procedure to include slight absorption, is presented. Program package RESPO, designed for such an analysis of the seismic response on the free surface of a general 2 — D laterally varying, geological near-surface structure assuming P, SV or SH plane-wave incidence from below, is briefly described. The package is tested on the classical model of a sedimentary basin. The study differs from previous applications of the ray method to the basin model in the following aspects. The frequency-domain approach is used. A comparison of the ray method results with the results of the discrete wavenumber method for long periods is made. More attention is paid to the analysis of the formation of the wave field. This analysis reveals two main types of wave propagation inside the basin: the dominant horizontally propagating local interference waves and less expressive vertically propagating waves in the central part of the basin. Effects of slight absorption (Futterman's causal absorption) are considered. The absorption causes a decrease in amplitudes and time delays at later times. The decrease in the amplitudes is not so expressive because of large periods and relatively short travel times of the waves investigated.


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How to Cite
Moczo, P., Bard, P.-Y., & Pšenčik, I. (1987). Seismic response of two-dimensional absorbing structures by the ray method. Journal of Geophysics, 62(1), 38-49. Retrieved from https://journal.geophysicsjournal.com/JofG/article/view/136

References

Bard, P.-Y., Bouchon, M.: The seismic response of sediment-filled valleys. Part 1. The case of incident SH waves. Bull. Seismol. Soc. Am. 70, 1263-1286, 1980

Bard, P.-Y., Gariel, J.Ch.: The seismic response od 2-D sedimentary deposits with large vertical velocity gradients. Bull. Seismol. Soc. Am. 76, 343-366, 1986

Boore, D.M., Larner, K.L., Aki, K.: Comparison of two independent methods for the solution of wave scattering problems: response of a sedimentary basin to vertically incident SH waves. J. Geophys. Res. 76, 558-569, 1971

Cerveny, V.: Approximate expressions for the Hilbert transform of a certain class of functions and their application to the ray theory of seismic waves. Stud. Geophys. Geod. 20, 125-132, 1976

Cerveny, V.: The application of ray tracing to the numerical modeling of seismic wavefields in complex structures. In: Helbig, K, Treitel, S. (Eds.) Handbook of Geophysical Exploration. Section I: Seismic exploration. Dohr, G. (Ed.) Volume on Seismic shear waves, pp. 1-124. Geophysical Press, London 1985a

Cerveny, V.: Ray synthetic seismograms for complex two-dimensional and three-dimensional structures. J. Geophys. 58, 2-26, 1985b

Cerveny, V., Frangie, A.B.: Elementary seismograms of seismic body waves in dissipative media. Stud. Geophys. Geod. 24, 365-372, 1980

Cerveny, V., Frangie, A.B.: Effects of causal absorption on seismic body waves. Stud. Geophys. Geod. 26, 238-253, 1982

Cerveny, V., Hron, F.: The ray series method and dynamic ray tracing systems for 3 - D inhomogeneous media. Bull. Seismol. Soc. Am. 70, 47-77, 1980

Cerveny, V., Pšenčik, I.: SEIS83 - Numerical modeling of seismic wave fields in 2-D laterally varying layered structures by the ray method. In: Engdahl, E.R. (Ed.) Documentation of earthquake algorithms, Report SE-35, pp. 36-40. World Data Center (A) for Solid Earth Geophysics, Boulder, CO USA 1984

Cerveny, V., Ravindra, R.: Theory of seismic head waves. Toronto: University of Toronto Press 1971

Cerveny, V., Molotkov, I.A., Pšenčik, I.: Ray method in seismology. Praha: Karlova Universita 1977

Dravinski, M.: Scattering of plane harmonic SH wave by dipping layers of arbitrary shape. Bull. Seismol. Soc. Am. 73, 1303-1319, 1983

Futterman, W.l.: Dispersive body waves. J. Geophys. Res. 67, 5279-5291, 1962

Hong, T.L., Helm berger, D.V.: Glorified optics and wave propagation in nonplanar structure. Bull. Seismol. Soc. Am. 68, 1313-1330, 1978

Johnson, L.R., Silva, W.: The effects of unconsolidated sediments upon the ground motion during local earthquakes. Bull. Seismol. Soc. Am. 71, 127-142, 1981

Kjartansson, E.: Constant Q wave propagation and attentuation. J. Geophys. Res. 84, 4737-4748, 1979

Klem-Musatov, K.D., Aizenberg, A.M.: The ray method and the theory of edge waves. Geophys. J.R. Astron, Soc. 79, 35-50, 1984

Kohketsu, K.: 2-D reflectivity method and synthetic seismograms for irregularly layered structures - I. SH-wave generation. Geophys. J.R. Astron. Soc. 89, 821-838, 1987

Kravtsov, Yu.A., Orlov, Yu.I.: Geometrical optics of inhomogeneous media (in Russian). Moscow: Nauka 1980

Krebes, E.S.: The viscoelastic reflection/transmission problem: two special cases. Bull. Seismol. Soc. Am. 73, 1673-1683, 1983

Langston, Ch.A., Lee, J.J.: Effect of structure geometry on strong ground motions: the Duwamish river valley, Seattle, Washington. Bull. Seismol. Soc. Am. 73, 1851-1863, 1983

Lee, J.J., Langston, Ch.A.: Three-dimensional ray tracing and the method of principal curvature for geometric spreading. Bull. Seismol. Soc. Am. 73, 765-780, 1983a

Lee, J.J., Langston, Ch.A.: Wave propagation in a three-dimensional circular basin. Bull. Seismol. Soc. Am. 73, 1637-1653 1983b

Moczo, P., Cerveny, V., Pšenčik, I.: Documentation of earthquake algorithm - RESPO (program package). In: Zahradnik, J. (Ed.) Short description of computer programs for studying seismic response of nearsurface geological structures, pp. 14-17. Inst. Geophysics, Charles University, Prague Czech Republic 1985

Moczo, P., Cerveny, V., Pšenčik, I.: Application of ray method in seismic response analysis. In: Schenk, V., Schenkova, Z. (Eds.) Proc. of the 3rd Inter. Symp. on the Analysis of Seismicity and on Seismic Risk, Vol. II, pp. 455-463. Geophys. Inst. Czechosl. Acad. Sci. Prague 1986

Mueller, G.: Rheological properties and velocity dispersion of a medium with power-law dependence of Q on frequency. J. Geophys. 54, 20-29, 1983

Nowack, R., Aki, K.: The two-dimensional Gaussian beam synthetic method: testing and application. J. Geophys. Res. 89, 7797-7819, 1984

Sanchez-Sesma, F.J., Bravo, M.A., Herrera, I.: Surface motion of topographical irregularities for incident P, SV and Rayleigh waves. Bull. Seismol. Soc. Am. 75, 263-269, 1985

Virieux, J.: SH-wave propagation in heterogeneous media: velocitystress finite-difference method. Geophysics 49, 1933-1957, 1984

Y erokhin, L. Yu.: The seismic propagation in a valley with semielliptical boundary (in Russian). Izv. Akad. Nauk SSSR, Fizika Zemli, No. 8, 60-73, 1985

Zahradnik, J., Hron, F.: Seismic ground motion of sedimentary valley La Molina, Lima, Peru. In: Schenk, V. Schenkova, V. (Eds.) Proc. of the 3rd Inter. Symp. on the Analysis of Seismicity and on Seismic Risk, Vol. II, pp. 340-346. Geophys. Inst. Czechosl. Acad. Sci. Prague 1986

Zahradnik, J., Urban, L.: Effect of a simple mountain range on underground seismic motion. Geophys. J.R. Astron. Soc. 79, 167-183, 1984