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The GRM provides an integrated approach to seismic refraction interpretation cognizant of the realities of the geologic environment. These realities include undetected layers, and layers with variable thicknesses and seismic velocities.

For the most effective use of the GRM, accurate optimum XY-values are necessary. Improved accuracy may result through the application of statistical methods to parameters derived from first arrival times.

However, the powerful methods of time series analysis, such as those used in seismic reflection processing, probably hold more promise. In fact, even though many methods of seismic refraction interpretation are either special cases of, or closely resemble the GRM, it may be more prudent to pursue the similarities between the GRM and the seismic reflection method. These similarities include the correspondenceb etween the time-depth and the one-way reflection time, as well as that between the average velocity and the RMS velocity. Furthermore, in each case it is possible to construct a time section which is independent of the accuracyo f the seismicv elocity determinationsi n the overlying layers.

Research and development into routine seismic refraction interpretation have been rather dormant for some time. I believe the development of time series analysisi n seismicr efraction processingt o be long overdue.

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