Improved vertical optical fiber borehole strainmeter design for measuring Earth strain

The Review of Scientific Instruments
Scott DeWolfWilliam Hatfield

Abstract

Fiber-based interferometers provide the means to sense very small displacements over long baselines, and have the advantage of being nearly completely passive in their operation, making them particularly well suited for geophysical applications. A new 250 m, interferometric vertical borehole strainmeter has been developed based completely on passive optical components. Details of the design and deployment at the Piñon Flat Observatory are presented. Power spectra show an intertidal noise level of -130 dB (re. 1 ϵ(2)/Hz), consistent within 1-3 dB between redundant components. Examination of its response to Earth tides and earthquakes relative to the areal strain recorded by an orthogonal pair of collocated, 730 m horizontal laser strainmeters yield a Poisson's ratio for local near surface material of 0.25 that is consistent with previous results.

References

Feb 13, 2004·Applied Optics·M A ZumbergeRobert L Parker
Sep 15, 1978·Applied Optics·C D Butter, G B Hocker
Oct 1, 1988·Applied Optics·M A ZumbergeH Hanada

Citations

Oct 3, 2019·The Review of Scientific Instruments·E MaccioniF Sorrentino

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