Fig. 1.

The S-wave velocity structure beneath each station in the initial model (blue lines) and refined model (red lines), and comparison of transverse components for the aftershock at 16:19 on February 2, 1995, with the observed velocity waveforms (black traces), the synthetic waveforms calculated from the initial model (blue traces), and the refined model (red traces). The stations (red triangles) and three aftershocks (yellow stars) used in the refinement are plotted in the uppermost and leftmost map. The number above the traces is the maximum amplitude of the observed velocity waveform in cm s⁻¹. The S-wave velocity structure and waveforms at station KBU are not shown because the initial model of KBU is good enough and therefore was not refined.