Seismic Waves in Laterally Inhomogeneous Media

The special issue contains contributions presented at the international workshop Seismic waves in laterally inhomo- geneous media IV, which was held at the Castle of Trest, Czech Republic, May 22-27, 1995. The workshop, which was attended by about 100 seismologists from more than 10 countries, was devoted mainly to the current state of theoretical and computational means of study of seismic wave propagation in complex structures. The special issue can be of interest for theoretical, global and explorational seismologists. The first part contains papers dealing with the study and the use of various methods of solving forward and inverse problems in complicated structures. Among other methods, discrete-wave number method, the finite-difference method, the edge-wave supperposition method and the ray method are studied and used. Most papers contained in the second part are related to the ray method. The most important topics are two-point ray tracing, grid calculations of travel times and amplitudes and seismic wave propagation in anisotropic media.

Inhalt
The Discrete Wave Number Formulation of Boundary Integral Equations and Boundary Element Methods: A Review with Applications to the Simulation of Seismic Wave Propagation in Complex Geological Structures.- Hybrid Seismic Modeling Based on Discrete-wave Number and Finite-difference Methods.- Accuracy of Elastic Finite Differences in Smooth Media.- Tube Wave Modeling by the Finite-difference Method with Varying Grid Spacing.- Time Domain Scattering of Acoustic Plane Waves by Vertical Faults.- Application of the Edge Wave Superposition Method.- Diffraction by Plane Sectors and Polygons.- Synthetic Seismograms in Heterogeneous Media by One-return Approximation.- Radiation Patterns of Point Sources Situated Close to Structural Interfaces and to the Earth's Surface.- Computation of Additional Components of the First-order Ray Approximation in Isotropic Media.- Coda Q as a Combination of Scattering and Intrinsic Attenuation: Numerical Simulations with the Boundary Integral Method.- Attenuation Operators and Complex Wave Velocities for Scattering in Random Media.- Derivatives of Reflection Point Coordinates with Respect to Model Parameters.- Ray Tomography Based on Azimuthal Anomalies.- Arrival-time Residuals and Hypocentre Mislocation.