Which perimeter security system is buried in the ground and uses geophones and seismic sensors to generate alerts based on pressure?

• A. Microwave sensors
• B. Buried and seismic sensors
• C. Photo-Electric transceivers
• D. Ground based radar

Answer: (B)

Buried seismic sensing relies on detecting ground vibrations to identify intrusions. When sensors are buried in the ground, geophones and seismic sensors pick up pressure waves and vibrations caused by footsteps, digging, or vehicles. Those vibrations are converted into electrical signals, and the system raises alerts when the vibration patterns indicate a potential breach. This approach is underground and uses seismic activity rather than line-of-sight or radar methods, making it well-suited for perimeter security where concealed detection is desirable.

Microwave sensors rely on emitted microwave beams and detect changes in reflection from moving targets, and are typically mounted above ground. Photo-electric transceivers use a light beam that is interrupted by an object crossing the path. Ground-based radar detects motion over a field using radio waves. None of these are buried and tuned to seismic ground vibrations like buried and seismic sensors.