| Abstract: | A pair of tiltmeters installed in a cave, at the lower suspension of a pair of large horizontal pendulums, showed similar tilts related to tidal effects but different tilts connected to seiches in the nearby Gulf of Trieste or to underground river floods. Such a difference has been ascribed to the different strain characteristics caused by the phenomena: the former one being mainly a rotation and the latter chiefly a distortion. It is suggested that several tiltmeters installed in a cavity could supply data that would allow one to describe the non-dilational part of the strain. |
