Fig. 4
From: Local earthquake response on the submarine communication cable in the northern South China Sea
One-channel P-Color of the DAS signals among 100 s after the origin time and the clear detail views. (a) 0.02–0.5 Hz band-pass filtering p-color shows the information of the surface gravity wave which occupy the main amplitude. (b) 0.5–2 Hz band-pass filtering p-color contains the waveform of the surface gravity wave and weak S wave. (c) 2–10 Hz band-pass filtering p-color in the front part of the cable go down to submarine with tilt support force display kind of S wave.
