Fig. 7
Comparison of surface-to-borehole spectral ratios of vertical component recordings during weak-motions (gray lines) and those during the mainshock (red lines) at KiK-net sites. The plots are arranged in order of the sites plotted in Fig. 5 (i.e., decreasing horizontal vector PGAs from top-left a to bottom-right p panels). Solid black lines denote mean spectral ratios for weak-motions and dashed gray lines one standard deviation. The vertical PGA in units of cm/s2, vertical PGV in units of cm/s, Vs30 in units of m/s, DNL values, and fault-to-site distance (R) in units of km are also included for each site. Note that the plot for site IBUH03 is not available due to malfunction of the vertical component instrument at underground. See Fig. 3 for site locations