Cave detection in limestone using ground penetrating radar

Ground penetrating radar (GPR) is becoming a more common component of the s tandard array of geophysical techniques that are used by archaeologists. In this paper, we report on the use of GPR to survey an area of archaeologica lly important karst topography at Kitley Caves in Devon, U.K. We describe t he use of GPR to detect voids within a limestone outcrop, as an aid to loca ting cave systems which might contain sediments suitable for excavation. Th e performance of the GPR equipment is analysed and the results compared to those obtained with an electrical resistance survey carried out at the same location. In particular, the depth of penetration of the GPR is estimated, and we report discernible echo signals from a much greater depth than is u sually reported in archaeological applications of GPR. Copyright 2000 Acade mic Press