Fig. 7
![Fig. 7](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs40623-018-0941-2/MediaObjects/40623_2018_941_Fig7_HTML.png)
Measured Rayleigh-wave phase-velocity dispersion curves: a BB station pairs; b SP station pairs; c integrated BB and SP station pairs. In a–c, the black lines indicate individual dispersion curves and the gray lines are the averages with standard deviations. d Number of phase-velocity measurements in a–c for each period. Phase-velocity maps were constructed from the 1–5-s period band