Fig. 6. Schematic annotated diagrams of (a) typical clandestine grave encountered in (a) Latin America and (b) temperate northern hemisphere scenariosSource: Modified from .Figure optionsDownload full-size imageDownload high-quality image (778 K)Download as PowerPoint slide
Simulated clandestine graves commonly encountered in Latin America have been created on PLX 4032 control test sites outside of Bogota, Colombia. These have included using ½ clothed pig cadavers as ‘fresh’ graves, historic graves using donated skeletonized human remains and beheaded and burnt donated skeletonized human remains.
Sequential monitoring of the simulated clandestine graves over 9 months by 250 MHz GPR on 2D profiles showed that the pig cadavers could be imaged up to 7 months after burial, but the skeletonized remains were poorly imaged and the beheaded and burnt remains were poorly detected throughout the survey period, most probably due to a weak dielectric permittivity contrast between the skeletal remains and the surrounding soil. In contrast, the horizontal time slices showed generally good imaging of all of the simulated clandestine graves, probably due to a combination of the contrast between the disturbed grave soil and the background rural environment and the 2D GPR profiles being collected in both orientations over the survey area.