Refraction seismic methods are widely used in near surface investigations of geological structures. In the Department of Geophysics (University of Miskolc) a series expansion based inversion method was developed for the interpretation of refraction traveltime data. The experiences that we gained using this method show that the accuracy (or the errors) of trigger time have greater importance in near surface application than in the exploration of deeper regions. In this paper an experiment is described for the development of this inversion method for avoiding the interpretation problems originated from the inaccurate source time. In the presented inversion procedure traveltime differences are used instead of the measured simple traveltime dataset. Therefore a significant improvement is detected in the results of those cases where triggering error occurred. The method is tested on synthetic and field datasets as well. Further upgrade of this theory and its implementation into the series expansion based inversion method is planned in the near future.


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