Abstract
A recently built extensometer, which is based on a highly stable capacitance transducer, as well as a liquid bubble Hughes tiltmeter are discussed in view of monitoring strain and deformations at the Earth's surface. These instruments are being used to control local variations, whereas regional and global changes, including gravity variations, are monitored using repeated GPS and very precise relative gravimetry. With sufficient exterior control (such as absolute gravimetry for calibration, tidal measurements for separating tidal from other effects) we will acquire a more or less complete system (in combination with local leveling etc. as used by several other authors as well) for determination of time-dependent phenomena.
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