Abstract
A finite element model for the seismic behaviour of soils requires the definition of suitable boundary conditions to simulate the surrounding soil. These conditions are here analyzed theoretically under the only assumption that the boundary soil behaves elastically. Their application requires the definition of the wave direction. The one of impinging waves is known, being an input datum; the one of the outcoming waves is in general not known a priori. The amount of errors involved is discussed. Analogous problem was previously dealt with for sources of disturbances interiors to the represented portion of the space.
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