A Caltech Library Service

Fused-quartz extensometer for secular, tidal, and seismic strains

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.

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item:


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
Related URLs:
URLURL TypeDescription[1019:FEFSTA]2.0.CO;2DOIArticle
Additional Information:Copyright © 1959, The Geological Society of America, Inc. Received August 18, 1958.
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Caltech Division of Geological Sciences898
Issue or Number:8
Record Number:CaltechAUTHORS:20140806-154620758
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48145
Deposited By: George Porter
Deposited On:06 Aug 2014 22:58
Last Modified:10 Nov 2021 18:04

Repository Staff Only: item control page