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Long Base Line Tilt and Strain Measurement

DOI: 10.1016/b978-0-444-41783-1.50018-0


(Accepted for publication March 24, 1978) ABSTRACT: Two types of noise afflict strain and tilt measurement. They may be categorized as “active” noise, which is due to atmospheric pressure variations, temperature variations, water-table variations and so forth; and “passive” or signal-generated noise which is a consequence of the interaction of the strain field of interest with inhomogeneities of material properties local to the measurement site. The reason why both types of noise are normally reduced by the use of long base line instruments is explained and a simple, practical long base line tiltmeter is described.

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