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Teleseisms monitoring using chirped-pulse phi OTDR
Fernández-Ruiz, M.R.; Williams, E.L.; Magalhaes, R.; Vanthillo, R.; Costa, L.; Zhan, Z.; Martin-Lopez, S.; González-Herráez, M.; Martins, H.F. (2019). Teleseisms monitoring using chirped-pulse phi OTDR, in: Kalli, K. et al. Seventh European workshop on optical fibre sensors. Proceedings of SPIE, the International Society for Optical Engineering, 11199. https://dx.doi.org/10.1117/12.2539966
In: Kalli, K.; O'Keeffe, S.O.; Brambilla, G. (Ed.) (2019). Seventh European workshop on optical fibre sensors. Proceedings of SPIE, the International Society for Optical Engineering, 11199. SPIE: Washington. ISBN 9781510631236 . , more
In: Proceedings of SPIE, the International Society for Optical Engineering. SPIE: Bellingham, WA. ISSN 0277-786X; e-ISSN 1996-756X, more
Peer reviewed article  
Keyword
    Marine/Coastal
Author keywords
    Rayleigh scattering; optical time-domain reflectometry; seismology;distributed sensing
Authors  Top 
  • Fernández-Ruiz, M.R.
  • Williams, E.L.
  • Magalhaes, R.
  • Vanthillo, R.
  • Costa, L.
  • Zhan, Z.
  • Martin-Lopez, S.
  • González-Herráez, M.
  • Martins, H.F.
Abstract
    Monitoring of seismic activity around the word is a topic of high interest for the analysis and understanding of deep Earth dynamics. However, the deployment of a homogeneous network of seismic stations both onshore and offshore poses a strong economic challenge that makes this solution practically inviable. Using the pre-existing fiber optical network for seismic monitoring arises as an excellent solution with important advantages in terms of ubiquity and cost. In this communication, we present the detection of an M8.2 earthquake occurred in Fiji Island using distributed acoustic sensing based on chirped-pulse phi OTDR. Two sensors were placed simultaneously at two different locations at >9,000 km from the earthquake epicenter: a metropolitan area and a submarine environment. The recorded data is post-processed using a 2D linear filter to cancel out environmental noise. The resulting signals are compared with the signals acquired by nearby seismometers. The attained good matching between the recorded data and the seismometer data shows the strong potential of the use of the already-deployed communication fiber network for teleseism monitoring.
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