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Taking advantage of the research results of the transmission wave field response in in-seam seismic survey(ISS), and according to the related laws between the L-wave dispersion characteristics and the seam thickness, the technology based on the transmission method of ISS has been developed for quantitative detection of coal seam thickness, and the such experiments had been carried out in Yima mining area, HenNan province., where the coal seam thickness is 2.2 m. the tomographic image was formed by 185 Hz, then 5 thin coal zones were circled in which the thickness is less than 1.5 m. The forecast accuracy was verified by mining and reconstruction recorder. It was put forward that the transmission method of ISS have realized high precision detection of coal seam thickness and can be used to guide the safe and efficient production in coalmine.

Determination between transmission wave field of in-seam seismic survey and thickness of coal seam