PRESENT-DAY VERTICAL MOVEMENTS IN THE SOUTHERN PART OF THE RHINEGRABEN (FRANCE)

Active deformation in the southern part of the Rhinegraben, studied by comparing leveling measurements, is characterized by vertical movemen ts. Upward movements greater than I. mm.y(-1) have been measured near Mulhouse and Selestat. Smaller rates of uplift averaging 1 mm.y(-1) we re also observed above some groups of salt plugs striking NW-SE. Both types of vertical uplift are compatible with the regional stress field . The movements may be associated with the reactivation of NE-striking Variscan thrusts and with continuing upward growth of those salt plug s that are perpendicular to the minimum horizontal stress. ((C) Academ ie des sciences / Elsevier, Paris.)