ATRAK

ATRAK (Guest and Kendall, CJEG v29 pp 78-92, 1993) is a 3D, fully-anisotropic (up to triclinic symmetry) seismic raytracer. It is a commercial code sold and supported through Outer Limits Seismic Software. My work on this code is in a development, support and training role. This has included the development of visualisation software, and additional support codes.

Models

Models in ATRAK are 2.5D (variation in X and Z, and extent only in Y). They can include velocity gradients, horizon structure and multiple layers of anisotropy with fully-general symmetry.


Raytracing

Raytracing in ATRAK is fully 3D. Multiple source positions, take-off angles and azimuths can be specified, and direct-waves, reflections and conversions.


Synthetics

Synthetic seismograms in ATRAK, are generated by interpolation of travel-time curves and convolution with a specified wavelet. Synthetics can be 2D or pseudo-3D.