Figure 4From: Anisotropic Rayleigh-wave phase velocities beneath northern Vietnam Seismograms and corresponding spectro-temporal diagrams for an event occurring in Indonesia in July 2007, and recorded at stations HBVB (top) and BGVB (bottom). The bottom panel shows the cross-correlation between the two seismograms and the corresponding spectro-temporal diagram. The white curves represent the maximum energy recorded for all frequencies.Back to article page