Which instrument detects ground vibrations and is another name for geophone?

• A. Jug
• B. Seismograph
• C. Microgel
• D. Knuckle Joint

Answer: (A)

Ground vibrations are seismic waves. A geophone is a sensor that detects ground motion and converts it into an electrical signal. The instrument that both detects and records those vibrations over time is the seismograph. In practice, geophones are used with seismographs to capture seismic data, so seismograph is the term most closely associated with measuring ground vibrations. The other options don’t relate to seismic measurement at all—jugs hold liquids, microgel is a material, and a knuckle joint is a mechanical connector.