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and in 1970, are presented. An analysis of these data shows that the altitude
variations of bench marks in the considered triennial period seem to originate from
the collective rotation of an inclined plane, which intersects the geoid surface with
an azimuth of 43° to the North.
This is in accordance with the orientation of the fault pattern given by local
The fact that the existing bench marks were sited along the coastline, and the
lack of a comparison with data relative to motion on more compact geological
structures, lead necessarily to provisional conclusions.
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