Joint analysis of multi‐shot, multi‐channel surface‐wave data and micro‐gravity data

Abstract

This paper presents a joint analysis of a surface-wave method and a micro-gravity survey for estimating both S-velocity and density model of the ground. Two have been performed for delineating a buried channel filled with soft alluvium sediments. A CMP cross-correlation analysis of surface-waves was applied to multi-shot and multi-channel surface-wave data and an S-velocity model was obtained. The micro-gravity survey has been performed on the same survey line and a clear low Bouguer anomaly area was detected. The gravity data was analyzed based on the S-velocity model obtained through the surface-wave analysis. The S-velocity model was converted into a density model by the information of laboratory soil tests. Theoretical gravity anomaly was calculated and compared with the observed data. The density model was modified for reducing residual with a least square method. A clear low-density area was obtained and it agrees with a low S-velocity area obtained from the surface-wave method.