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These are perspective (above) and plan (right) views of elastic SH waves propagating in a square of isotropic material that includes (on its lower left corner) a square wedge of a different material. The direct, reflected and refracted wavefronts 1000 ms after the initial time are clearly seen.

The mesh is 256x256 points and the computation is done using the pseudospectral method ( see Lou & Rial, 1995; Geophys. J. Int. 120,60-72 for more detailed discussion of the method ). A point source is located at the center of the large square. The method is used to model propagation and diffraction in more complex media, such as in anisotropic and hetereogeneous materials. Click on our section Computer Simulations of Wave Phenomena , where results of the method for more general anisotropic / hetereogeneous media are presented. Visualization is performed using Mathematica. (check below for a link to Mathematica in Education and Research )

Lab Location:

Collaborators:

• Prof R.R. Reeber, robert_reeber@ncsu.edu
• Dr. Kai Wang, kai_wang@ncsu.edu
• Prof. P. Malin, Dr. E. Shalev, Duke University
• Dr. Victor Pereyra, Weidlinger Associates, Los Altos, CA.
• Prof. M. Ritzwoller, A. Levshin, O. Vdovin, University of Colorado at Boulder

Telephone:

Research Activities and Projects

Earthquake Response of Sedimentary Basins

Shear-wave Splitting in Fractured Reservoirs

Signal Analysis of Geologic and Climatologic Time Series

Tomography of South America, The SISAL project

A collaborative research with the Geophysics Group at the University of Colorado, Boulder

Mineral Physics

For more information, please contact WPL director, Dr. J.A. Rial at the email address below

J.A. Rial, jar@email.unc.edu

Back to Geology Homepage

Link to Mathematica In Education and Research, a quarterly journal devoted to educators who use Mathematica to enhance the teaching and learning in their courses in the fields of science, engineering and mathematics.