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Earth, Planets and Space
Fig. 2 | Earth, Planets and Space

Fig. 2

From: Detailed S-wave velocity structure of sediment and crust off Sanriku, Japan by a new analysis method for distributed acoustic sensing data using a seafloor cable and seismic interferometry

Fig. 2

Calculated CCFs. Calculated CCFs. Each trace was normalized by its amplitude. A and B—CCFs at a distance of 39.94 km from the coast without and with an FK filter, respectively. The frequency range was between 0.17 and 0.50 Hz. C and D—CCFs without and with an FK filter at 67.48 km from the coast in the frequency range between 0.10 and 0.25 Hz. SNR indicates the signal-to-noise ratios calculated by Bensen’s (2007) method. The dashed lines indicate an apparent velocity of 0.5 km/s. The FK filter improves the SNR values and enables effective extraction of surface waves

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