Table 3: Geological parameters.

Layer number	Types	Thickness m	Shear wave velocity m/s	Compression wave velocity/ m/s	Dynamic elastic modulus MN/m2	Dynamic Poisson's ratio	Density kg/m3	Damping ratio
1	Mixed backfill soil	0~3	173	356	139	0.35	1650	0.02
2	Silt Clay	3~18	235	473	308	0.33	2010	0.02
3	Pebble and Round gravel	18~100	332	620	670	0.29	2050	0.02