The refraction seismic method was introduced into geophysics in 1920 by L .Mintrop. The Orchid salt dome was the first oil field discovered 1924 by this method. The success of the seismic method in petroleum exploration and the financial background of this branche encourages the development of more and more detailed analysis methods in both, the reflection and refraction seismic method. The rather simple RSA methods using critical distance or intercept time are nowadays in the era of computerization replaced by more sophisticated methods like the Wave Front Method, the Plus Minus Method or the Generalized Reciprocal Method.