Fig. 2
From: Secular and coseismic changes in S-wave velocity detected using ACROSS in the Tokai region
Reference transfer functions. Reference transfer functions, which were obtained by averaging all of the daily transfer functions at each station, are shown by blue lines. The area shaded in orange color shows the 3-s window from the arrival time of S-waves in the JMA 2001 travel time table. Red lines show the reference wave that we used