The same content as in Fig. 2, with random noise introduced into the seismograms. Before the splitting measurements, the north and east components were rotated counter-clockwise by θ=−20° to represent correcting the misalignment. After measurement, the best-fitting splitting parameters are φ= 50°, δt= 1.76 s by the SC method in (b), φ= 52°, δt= 1.68 s by the RC method in (c), and φ= 50°, δt= 1.76 s by the EV method in (d).