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Proceedings Paper

Results from a borehole optical fiber interferometer for recording Earth strain
Author(s): Mark A. Zumberge; Scott DeWolf; Frank K. Wyatt; Duncan C. Agnew; Don Elliott; William Hatfield
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Paper Abstract

We have installed a set of 250 m long borehole optical fiber strainmeters at Piñon Flat Observatory in southern California, USA. These instruments consist of an optical fiber stretched between two positions in the borehole – the upper position is at depth of 4 m and the lower is at a depth of 254 m. The tensioned optical fiber’s length is monitored interferometrically; vertical Earth strain is determined by recording the fiber length change over this interval. We achieve a strain sensitivity of about 0.01 n(epsilon) (10–11) at periods near 1 s. The noise in the tidal band is 300 n(epsilon)/√Hz (near 1cycle per day). After an initial settling period of about a year, the instrument drift is 1-2 μ(epsilon) per year.

Paper Details

Date Published: 20 May 2013
PDF: 6 pages
Proc. SPIE 8794, Fifth European Workshop on Optical Fibre Sensors, 87940Q (20 May 2013); doi: 10.1117/12.2025896
Show Author Affiliations
Mark A. Zumberge, Univ. of California, San Diego (United States)
Scott DeWolf, Univ. of California, San Diego (United States)
Frank K. Wyatt, Univ. of California, San Diego (United States)
Duncan C. Agnew, Univ. of California, San Diego (United States)
Don Elliott, Univ. of California, San Diego (United States)
William Hatfield, Univ. of California, San Diego (United States)


Published in SPIE Proceedings Vol. 8794:
Fifth European Workshop on Optical Fibre Sensors
Leszek R. Jaroszewicz, Editor(s)

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