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P142 ELASTIC / ELECTROMAGNETIC WAVE PROPAGATION – EQUIVALENCES AND 2D MODELLING OF GPR R. LAURAIN and I. LECOMTE Abstract 1 Electromagnetic waves are often referred to as equivalent to acoustic waves or for reasons of identical polarizations perpendicular to the incidence plane as shear waves. We studied the propagation equation and the reflection/transmission coefficients for both seismics and electromagnetism in order to draw a more precise equivalence. It shows that in 2D the Transverse Electric (TE) mode can be directly modeled as an acoustic wave. For the Transverse Magnetic (TM) mode there is no direct equivalence with seismic since the