A brief study of applications of the generalized reciprocal method and of some limitations of the method

An analysis of the generalized reciprocal method (GRM), developed by Palmer for the interpretation of seismic refraction investigations, has been carr ied out. The aim of the present study is to evaluate the usefulness of the method for geotechnical investigations in connection with engineering proje cts. Practical application of the GRM is the main object of this study rath er than the theoretical/mathematical aspects of the method. The studies are partly based on the models and field examples presented by Palmer. For comparison, some other refraction interpretation methods and te chniques have been employed, namely the ABC method, the ABEM correction met hod, the mean-minus-T method and Hales' method. The comparisons showed that the results, i.e. the depths and velocities determined by Palmer, are part ly incorrect due to some errors and misinterpretations when analysing the d ata from field examples. Due to the limitations of the GRM, some of which are mentioned here, stated by Palmer in his various publications, and other shortcomings of the metho d (e.g. the erasing of valuable information), the GRM must be regarded as b eing of limited use for detailed and accurate interpretations of refraction seismics for engineering purposes.