High-resolution reflected P- and SH-wave imaging for the shallow subsurface in the thick Quaternary area

Abstract

Abstract For the construction of urban underground space, the shallow stratum structure from surface to 200 meters needs to be high-precision investigated. As limited in the theoretical level, the normal reflection P-wave can’t image in the very shallow subsurface especially in a thick Quaternary area. The SH-wave survey has a higher resolution in the theoretical level because the SH-wave has a lower velocity and shorter wavelength. The aim of this paper is to present a combined seismic reflection survey of P- and SH-wave in a thick Quaternary area where is close to Xiong’an New Area. By using the (λ/4) criterion, we obtain a resolution around 1.4m and 2.4 m for the SH-wave section in 9 m (v=169 m/s and f=30 Hz) and 50 m (v=209 m/s and f=22 Hz) depth separately and a resolution around 3.8m for the P-wave section in 200 meters depth (v=1878 m/s and f=125 Hz).