抄録
During the IDNDR decade geodynamic monitoring stations have been installed in many tectonically active areas. The improvement of sensor- and data acquisition techniques considerably broadened the observation of strain induced (tidal) signals, including an increasing number of 'nonclassical' quantities like physico-chemical parameters of ground water or electrical resistivity. As a continuous and well known source of deformation acting on the earth at any place and any time, earth tides provide a unique possibility to validate the coupling of the sensors to the ground, to carry out in situ calibrations and to check the temporal stability of the response characteristics. The response to an imposed tidal strain may provide insight into the physics and the linearity/non-linearity of the strain coupling mechanisms which is important especially for ?enatural' strain sensors like wells and thermal/mineral springs. If the recording system provides calibration facilities, the local tidal response functions may be investigated with respect to changes of mechanical properties of the crust during the preparation of earthquakes and volcanic eruptions.
