A cross-hole seismic refraction investigation was conducted in Nasiriya City, Dhi Qar Governorate, Iraq, using boreholes to survey compressional and shear waves. The study aimed to determine the depths and thicknesses of subsurface layers of soil, their dynamic elastic modulus, and the groundwater level beneath a proposed building for future residential complex use. The calculations of P and S-wave revealed two shallow subsurface layers, with the first layer consisting of gray silty sandy clay soil and the second layer composed of brown and green silty sand soil with clay. The average compressional and shear wave velocities were 1304.0 m/sec and 737.00 m/sec, respectively. The mean dynamic elastic constants ranged between κ= 219.062­–2491.62 MPa, μ= 67.408–1589.30 MPa, E= 195.428–1993.15 MPa, λ= 164.26–1520.55 MPa, Dynamic Ks=0.256-1.86, and v= 0.23-0.458. Site engineering information involving geotechnical characteristics was measured and analyzed to enhance the study's main goals. The results were acceptable and accurate according to specific civil engineering criteria and the structural design code, including the elasticity coefficients. The shear wave velocity was more sensitive to rigidity, particularly the horizontal component, and the soil had medium specifications and medium soil conditions.