Time domain reflectometry (TDR) is a method of locating the depth to a shear plane or zone in a landslide. TDR uses an electronic voltage pulse that is reflected like radar from a damaged location in a coaxial cable. To monitor slope movement, coaxial cables are grouted in boreholes and interrogated using a cable tester. Characteristic cable signatures can be stored and compared over time for changes, indicating slope movement. Advantages of using TDR over conventional servo-accelerometer probes include relatively low cost time savings, immediate determination of slope movement, and the capability to monitor cables remotely using dataloggers and telemetry