  A comparison of the displacements of the earth's surface after an earthquake
was made, calculating with the analytical expressions coming from an infinite
flat slab approximation and compared with these numerically considering the
topography of the Earth. One conclusion of this work is that the flat Earth
approximation, has a greater error in the lateral displacement than in the
vertical one. It can also be noted that the error in the magnitude of the
displacement is less or of the order of ten percent of the maximum displacement
of the earth's surface.
