Accession Number : ADA292659

Title :   Eurasian Seismic Surveillance - 2D FD Seismic Synthetics and Event Discrimination

Descriptive Note : Final rept. 1 Oct 92-30 Sep 94,

Corporate Author : OSLO UNIV (NORWAY)

Personal Author(s) : Ruud, Bent O. ; Husebye, Eystein S.

PDF Url : ADA292659

Report Date : 23 FEB 1995

Pagination or Media Count : 67

Abstract : Most efforts have been devotes to 2D FD synthetics for simulating seismic wave propagation in a complex lithosphere. The FD scheme used is tied to the numerical solution of the elastodynamic wave equation. We have demonstrated the usefulness of this approach by computing synthetic seismograms for a set of progressively complex lithosphere models. In practice, model set-up for FD computations have proved cumbersome so we have elaborated on automating structural model generation. The computed synthetics are SEG-Y formatted and thus are easily processed using standard software packages like the ProMAX. As part of the 2D FD studies, we have critically examined optimal design of boundary conditions in order to reduce edge reflection artifacts. Our synthetic wavefield scheme recently extended to 3D modelling can also handle surface topography. (AN)

Descriptors :   *FINITE DIFFERENCE THEORY, *SEISMIC DATA, *SEISMIC WAVES, MATHEMATICAL MODELS, COMPUTERIZED SIMULATION, SOFTWARE ENGINEERING, EXPERIMENTAL DATA, OPTIMIZATION, COMPUTATIONS, SURFACE WAVES, STRUCTURAL PROPERTIES, TWO DIMENSIONAL, NUMERICAL ANALYSIS, REFLECTION, TOPOGRAPHY, BOUNDARIES, WAVE PROPAGATION, EARTH CRUST, PERTURBATIONS, EARTH SURFACE, ARTIFACTS, WAVE EQUATIONS, LITHOSPHERE.

Subject Categories : Seismology
      Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE