Abstract
Two clinometric stations, 30 meters apart, have been established, belowa coverage of 600 meters, in a rectilinear gallery (unfinished railway tunnel, azimuth N 70°E, 4 kilometers length, nearly cylindrical section, 10 meters diameter) bored in the southern part of the crystalline Vosges (France). The reconstitution of the vertical deflections gives, at both stations, for the principal waves, exceptionally flattened ellipses whose great axis lie very near the direction of the tunnel. One obtains, for example, for λ(M2), 0,920 in the axis of the tunnel and 0.485 in the perpendicular direction. An interpretation of this phenomena is tried by considering the geometrical deformations near the hole cylinder constituted by the gallery under the influence of the tide-generating potential. The computation on a twodimensional model shows that the effect of the tunnel is negligible.
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