IDENTIFYING UNMARKED GRAVES WITH GROUND PENETRATING RADAR AT MT PISGAH STATE PARK

Ground penetrating radar, more commonly referred to as GPR, has become a popular geophysical method to perform subsurface surveys. GPR operates by sending high-frequency electromagnetic pulses into the ground from antennas that can vary in size and resolution. These pulses reflect off subsurface features and are used to produce a radargram that allows interpretation of subsurface anomalies. Different common features produce distinct reflections, so by analyzing reflections on a radargram anomalies can be detected. GPR, a technology first patented in 1904 by Christian Hülsmeyer, has become a common method in multiple disciplines to produce high resolution subsurface imagery in a non-invasive manner. GPR has been increasingly used to detect graves, as their exact location can often be lost due to a wide variety of reasons.

This research performs a geophysical survey to locate clandestine graves at an in-holding cemetery within Mt. Pisgah State Park in Tioga County, Pennsylvania. This work was initiated by Park Manager Rob Barrese, as a preliminary survey was needed to request state grant funding for repair and maintenance of the grounds. The study area was segmented into two grids to collect profile data for analysis using a Mala 500 Mhz antenna and rough terrain cart. Real-time radargrams were produced using Mala’s GroundVision software. Difficult terrain, riddled with gopher holes, bedrock outcrops, and vegetation of various sizes created many challenges for data acquisition. Post-processing was performed with GPR-Slice 3D analysis software. Results show several anomalies that may indicate clandestine graves.