Abstract

In the hilly terrain of fold belt area, the lithology and thickness of the weathering zone varies abruptly, posing a challenge in deciding the optimum depth. That is why, more number of uphole as well as shallow refraction surveys are being carried out by all seismic crews. The cost of these many numbers of SR survey using explosive is recurring and cumulative. More so due to the logistics involved in arranging security, licensed shot-firer etc. In this paper, the methodology of performing SR survey, using thumping or sledge hammer as a source, has been systematically established and consistently tested in actual field conditions. This is a need-based and cost-effective method which does not require explosive and associated logistics. The uniqueness of the project lies in the interfacing of thumping source with the Summit system, the establishment of accuracy of timing in laboratory condition, achievement of sufficiency in energy through the design of base plate and stacking, and validation of the method against Uphole and SR with explosive / dynamite source in varying field conditions.