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The research project described in this report is divided into three phases. The first phase addresses the direct global matrix method for computation of synthetic seismograms in layered visco-elastic media. The second phase describes applications of the direct global matrix method to simulation in the fields of seismology, underwater acoustics and soil-foundation interaction. Examples include VSP simulations, seismic shot record simulations, transmission loss simulations in underwater acoustics and vibration simulation of a circular foundation. The third phase describes two other methods. The first is based on the Cagniard-de Hoop technique and yields exact solutions for some idealised configurations (2- and 3-D), which are useful in verifying the accuracy of more general modelling schemes. The second method is an algorithm for forward modelling of seismic waves in 2-D isotropic, linearly elastic media with arbitrary density and velocity variations. Comparisons of numerical and analytical solutions are performed for various test cases. Application of the spectral algorithm is demonstrated on geological models with curved interfaces by combining global snapshots of wavefields and time sections obtained at selected points.

Additional information

Authors: VILMANN O, Odegaard & Danneskiold-SamsÝe ApS, Copenhagen (DK);GERSTOFT P, Odegaard & Danneskiold-SamsÝe ApS, Copenhagen (DK);BERG P ET AL., The Technical University of Denmark, Laboratory of Applied Mathematical Physics, Lyngby (DK);KRENK S, Aalborg University, Inst. of Building Technology and Structural Engineering, Aalborg (DK)
Bibliographic Reference: EUR 13171 EN (1990) 185 pp., MF, ECU 2
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