From: Estimation of shallow S-wave velocity structure using microtremor array exploration at temporary strong motion observation stations for aftershocks of the 2016 Kumamoto earthquake
Layer
Density (g/cm3)
V p (m/s)
V S (m/s)
Thickness (m)
1
1.6
\(\sqrt 3\) V S
70–150
1–50
2
1.8
150–500
3
1.9
1180
500
–