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Refraction surveys have been carried out over a large portion of Saudi Arabia during the past five years. Refraction work has proven to be both definitive and rapid, and has considerably expanded the scope and versatility of the geophysical approach in this area.

The interpretation principle that has been utilized has been referred to by others as the three-point system, the ABC method, the reciprocal procedure, two-way wavefront targeting, and the plus-minus method. It has apparently been widely used for weathering determinations, bedrock configurations, and shallow basement surveys. A more universal application of this theory for the interpretation of relatively incompetent refractors at great depths of burial has perhaps not been as generally recognized.

The recording and interpretation procedure that has been developed for refractors with a limited recording range is called the total time method. The construction involved is not complicated and provides a precise resolution of the refraction data. The computations are straightforward, and a program has been developed for an IBM 705 computer which will automatically calculate the intercept time, refractor velocity, refraction angle, vertical time, and depth to the refractor for each geophone location.

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