I propose a new concept of a seismic survey which takes advantage of mode-converted transmission waves. This method furnishes us with valuable information independent of any other survey which have been used to explore the Earth's structure. In the seismic reflection survey, both not mode-converted and mode-converted reflection waves are used in order to obtain the section of the reflectivity. In the seismic transmission survey, refraction waves with mode changes from P to SV or from SV to P in propagating through the interfaces are used in order to obtain the section of the transmissivity. The model consists of only a horizontally layered elastic medium. To correct the normal move-out of the transmission waves, I apply the method which have been developed to process the mode-converted reflection waves. The approximation error is estimated by comparing with the exact solution in the case of a horizontally two-layered medium. Numerical simulations prove that this method is available for the two-layered medium with the discontinuity which has the inclination of 30 degrees. ¿ American Geophysical Union 1992