A Study on the Passive Detection of Clandestine Tunnels

Abstract

The results and methods used in an experimental study on the passive seismic detection of underground tunnels are presented. The study included the characterization of some man-made activities within tunnels, the use of triangulation and seismic imaging as source localization techniques, and preliminary results of using a laser Doppler vibrometer for detecting vibrational activities within a tunnel. Some properties of the ground that pertain to the detection of tunnels and the experimental methods used to extract them are also described.