Abstract
THE invar wire earth strainmeter at the Nelson underground field station of the Physics and Engineering Laboratory, New Zealand, has produced the record shown in Fig. 1. The size of the two strain steps shown was far too great to be recorded on the tidal chart recorder but have been established with complete confidence from the amount of mechanical adjustment needed at the time of the inspection visits. Long term invar expansion has been removed from the curve shown. This is measured independently on an identical instrument decoupled from the earth using a sample of the same wire held at the same temperature and tension, but referred to very old large diameter Pyrex glass tubes as a reference length. Ideally, these should be of fused silica. The equation of the long term expansion agrees quite closely with that reported by Kaye1 in 1911.
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GERARD, V. Possible large creep event apparently preceded by a dilatant precursor. Nature 253, 520 (1975). https://doi.org/10.1038/253520a0
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DOI: https://doi.org/10.1038/253520a0
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