The graves are located at the places where this layer is absent because it was removed when the graves were dug.
Both situations would account for the hyperbolic texture observed in the GPR line data. Or, this layer may consist of coarse grained materials and large rocks, each one producing a hyperbolic response in the GPR cross-section. This boundary could be very rough, with a jagged interface with the material above. This layer is characterized by a hyperbolic “texture” many overlapping hyperbolas caused by the geometry of the layer (yellow box in Figure 2). GPR line at 3.5 meters over several graves The GPR reflections from this layer, visible between the graves, were initially thought to be the responses from the graves. Examining the cross section reveals that there is a strong scattering layer at about 0.7 meters depth. In fact, the hyperbolas are actually strong responses between the graves, while the graves in the depth slice are caused by weaker (low amplitude) GPR responses.įigure 2 shows the GPR line at 3.5 meters that runs over top of several graves. Looking closely, the hyperbolic responses seen in the GPR line do NOT correspond with the grave responses in the depth slice. The 20 × 10 meter grid was collected in a few minutes by collecting 21 parallel lines, each 20 meters long and spaced 0.5 meters apart. However, once a grid of data lines was collected and processed into depth slices, an interesting, unexpected pattern emerged that caused the operators to change their initial interpretation of the data. It is not an unreasonable interpretation to suggest that each hyperbola indicates the position of a grave.
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