An Experimental Investigation of Distributed Acoustic Sensing (DAS) on Lake Ice
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Published:2017-06
Issue:2
Volume:22
Page:167-176
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ISSN:1083-1363
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Container-title:Journal of Environmental and Engineering Geophysics
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language:en
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Short-container-title:JEEG
Author:
Castongia Ethan1, Wang Herb F.2, Lord Neal2, Fratta Dante3, Mondanos Michael4, Chalari Athena5
Affiliation:
1. Geoscience, University of Wisconsin-Madison*, 700 G. St. ATO 1286, Anchorage, AK 99501 U.S.A. 2. Geoscience, University of Wisconsin-Madison, Madison, WI 53706 U.S.A. 3. Geological Engineering, University of Wisconsin-Madison, Madison, WI 53706 U.S.A. 4. VP-Industrial Applications. Silixa Ltd., Elstree, Hertfordshire, U.K. 5. Environmental Engineer. Silixa Ltd., Elstree, Hertfordshire, U.K.
Abstract
A vibration-sensitive, Distributed Acoustic Sensor (DAS) array, using fiber-optic cables, was deployed in a triangularly shaped geometry on the frozen surface of Lake Mendota in Madison, Wisconsin, USA. The purpose of the array and testing program was to analyze the DAS response and to utilize the high spatial density of the distributed array for system response characterization in a well-constrained, small, surface array. A geophone array was also deployed to provide a reference system. The design of the array allowed us to assess the response of DAS with respect to distance from the seismic sources, the degradation of the response with length of the cable, the directivity of the fiber response with respect of the direction of the particle motion, and the quality of the signal with respect to cable type. The DAS array was examined for different cable constructions and orientations relative to the source propagation direction. Tight-buffered and loose-tube fiber-optic cable constructions were used, with both having good signal responses when well-coupled to the ice. In general, the tight-buffered cable was better suited for DAS applications. Directional sensitivity of the DAS was also inspected for several directions of wave propagation and particle motion. The results showed that the strongest DAS signals were recorded when the direction of the fiber was oriented parallel to the direction of particle motion. Finally, the DAS and geophone data sets were examined together to qualitatively determine, in conjunction with established DAS best practices, how the high spatial density offered by DAS could improve results over traditional point sensor arrays in certain situations.
Publisher
Environmental and Engineering Geophysical Society
Subject
Geophysics,Geotechnical Engineering and Engineering Geology,Environmental Engineering
Reference23 articles.
1. Baldwin, J., Fratta, D., Wang, H., Lord, N, Nigbor, R., Chalari, A., Karaulanov, R., Lancelle, C., and Castongia, E., 2014, Using distributed acoustic sensing (DAS) for Multichannel Analysis of Surface Waves (MASW) to evaluate ground stiffness: Abstract NS31C-3938, 2014 Fall Meeting, AGU, San Francisco, Calif., 15–19 Dec. 2. Field testing of fiber-optic distributed acoustic sensing (DAS) for subsurface seismic monitoring 3. Field testing of modular borehole monitoring with simultaneous distributed acoustic sensing and geophone vertical seismic profiles at Citronelle, Alabama 4. A New Approach for Exploring Ice Sheets and Sub-Ice Geology 5. Ewing, M., and Crary, A.P., 1934, Propagation of elastic waves in ice. Part II: Journal of Applied Physics, 5, 181–184.
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