Table 1 1D Velocity Model under GRA1, from Krüger (1994).

From: Monitoring ground water storage at mesoscale using seismic noise: 30 years of continuous observation and thermo-elastic and hydrological modeling

Layer Thickness (m) Vp (km/s) Vs (km/s) Density
200 5.6 + − 0.5 3.2 + − 0.4 2.8
300 3.5 + − 1.3 0.9 + − 0.1 2.4
650 2.4 + − 0.2 1.6 + − 0.3 2.4
1000 5.9 + − 0.4 3.5 + − 0.5 2.8