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Amongst a number of precursory features in the atmosphere observed through Electro Magnetic (EM) techniques, the variabilites of the lower and upper atmosphere are considered to have yielded reasonably satisfactory results, though reliabilities as nowcasting are yet to be ascertained . Of recent interest in such studies are the waves and undulations possibly generated by Earth Quake (EQ) preparatory processes. Even with number of studies taken up in relevance to this issue, more inputs are necessary to make comprehensive views of generation process of such waves with special reference to an impending EQ . Under this background the paper presents analysis of Total Electron Content (TEC) and Scintillation from GPS observation at Guwahati in identifying generation of waves prior to an earthquake for realizing Lithosphere -Troposphere -Ionosphere (LTI) coupling dynamical status caused by EQ preparatory processes. The anomalous appearance of satellites from beyond the normal Line of Sight (LOS) prior to an EQ and their positions analyzed through respective azimuthal status ( with PRN in each case) are finally utilized in identifying the sources associated with generation of waves. The role of EQ induced tropospheric parameters as Radio Refractive Index (RRI) and Effective Earth Radius are brought in to the ambit of discussions.