f A Field Experiment of Micro-Gravity Survey for very Shallow Subsurface Investigations

The authors have developed the micro gravity method, which is based on μGal-order gravity measurements, for the shallow subsurface mapping in engineering and environmental applications (Nozaki and Kanemori, 1996). The experiment shown in this paper was conducted to examine the applicability of the micro-gravity method we developed to very shallow subsurface investigations down to around ten meters in depth.