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An Experimental Investigation of Distributed Acoustic Sensing (DAS) on Lake Ice

Journal Article · · Journal of Environmental and Engineering Geophysics
DOI:https://doi.org/10.2113/jeeg22.2.167· OSTI ID:1638784
 [1];  [2];  [2];  [2];  [3];  [3]
  1. Univ. of Wisconsin, Madison, WI (United States); University of Wisconsin-Madison
  2. Univ. of Wisconsin, Madison, WI (United States)
  3. Silixa Ltd., Hertfordshire (United Kingdom)
+ Show Author Affiliations
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. Lastly, 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.
Research Organization:
Univ. of Wisconsin, Madison, WI (United States)
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Renewable Power Office. Geothermal Technologies Office
Grant/Contract Number:
EE0006760
OSTI ID:
1638784
Journal Information:
Journal of Environmental and Engineering Geophysics, Journal Name: Journal of Environmental and Engineering Geophysics Journal Issue: 2 Vol. 22; ISSN 1083-1363
Publisher:
Environmental and Engineering Geophysical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Ground motion response to an ML 4.3 earthquake using co-located distributed acoustic sensing and seismometer arrays journal March 2018
Distributed acoustic sensing (DAS) field trials for near-surface geotechnical properties, earthquake seismology, and mine monitoring conference August 2018

Figures / Tables (13)

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