Ground-penetrating radar (GPR) works by emitting pulses of radar into the ground, which are reflected, absorbed, or otherwise deflected by buried features.  The return time of these pulses indicate the depth of the anomaly. GPR excels at identifying structure foundations, buried roads/footpaths, and tunnels or other features that trap air.

In 2017, our project utilized a 400 mhz antenna across the entire surface of the Main Plaza and used a 200 mhz antenna in selected areas. Local conditions at Monte Albán (e.g., sediment composition, moisture content) proved favorable and yielded good quality data.