Using existing undersea fiber cables to detect seismic events

Detection of the Northern Peru earthquake. (A) Map of the cable sections used in this measurement. Sections e, g and h correspond to sections S3, S4 and S5 in Fig. 2C. (B) Time series and spectrograms of the signals detected on the 9 spans under test. The panels labeled “Entire cable” shows the time series and spectrogram of the signal detected on the entire UK-Canada. The right bottommost panel shows the spectrogram of the same signal but on a linear scale for better visualization of the higher frequency range (0.2–1.4 Hz). The signal on the entire UK-Canada cable shows a high level …

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