Benioff, Hugo (1959) Fused-quartz extensometer for secular, tidal, and seismic strains. Geological Society of America Bulletin, 70 (8). pp. 1019-1032. ISSN 0016-7606. doi:10.1130/0016-7606(1959)70[1019:FEFSTA]2.0.CO;2. https://resolver.caltech.edu/CaltechAUTHORS:20140806-154620758
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Abstract
A description is given of two fused-quartz extensometers located in mountain tunnels at Dalton Canyon and Isabella in Southern California and designed for observing long-period seismic-wave strains, earth tidal strains, and secular strains. They consist essentially of instruments for measuring and recording variations in the separation of two piers by comparison with a length standard of fused-quartz tubing. The sensitivity for secular strains, denned as the least detectable strain increment, is approximately 10^(−7). For tidal and seismic-wave strains, the sensitivity is higher—a 1-mm deflection of the recorder represents a strain increment of 5.2 × 10^(−10). In both cases the maximum usable sensitivity is limited by ground-strain unrest or noise, generated by wind, barometric-pressure variations, temperature variations of the surface layers of the ground, and variations in ground-water saturation.
| Item Type: | Article | |||||||||
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| Additional Information: | Copyright © 1959, The Geological Society of America, Inc. Received August 18, 1958. | |||||||||
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| Issue or Number: | 8 | |||||||||
| DOI: | 10.1130/0016-7606(1959)70[1019:FEFSTA]2.0.CO;2 | |||||||||
| Record Number: | CaltechAUTHORS:20140806-154620758 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140806-154620758 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 48145 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | George Porter | |||||||||
| Deposited On: | 06 Aug 2014 22:58 | |||||||||
| Last Modified: | 10 Nov 2021 18:04 |
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