Teleseisms monitoring using chirped-pulse φOTDR

María R. Fernández-Ruiz; Ethan L. Williams; Regina Magalhaes; Roel Vanthillo; Luís Costa; Zhongwen Zhan; Sonia Martin-Lopez; Miguel Gonzalez-Herraez; Hugo F. Martins

doi:10.1117/12.2539966

28 August 2019 Teleseisms monitoring using chirped-pulse φOTDR

María R. Fernández-Ruiz, Ethan L. Williams, Regina Magalhaes, Roel Vanthillo, Luís Costa, Zhongwen Zhan, Sonia Martin-Lopez, Miguel Gonzalez-Herraez, Hugo F. Martins

Author Affiliations +

Proceedings Volume 11199, Seventh European Workshop on Optical Fibre Sensors; 1119921 (2019) https://doi.org/10.1117/12.2539966
Event: Seventh European Workshop on Optical Fibre Sensors, 2019, Limassol, Cyprus

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 φOTDR. 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 postprocessed 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.

Citation Download Citation

María R. Fernández-Ruiz, Ethan L. Williams, Regina Magalhaes, Roel Vanthillo, Luís Costa, Zhongwen Zhan, Sonia Martin-Lopez, Miguel Gonzalez-Herraez, and Hugo F. Martins "Teleseisms monitoring using chirped-pulse φOTDR", Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 1119921 (28 August 2019); https://doi.org/10.1117/12.2539966

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