Concept: An earthquake produces vibrations that need to be detected and recorded by a special instrument.
Explanation:An earthquake generates shock waves and tremors in the ground.
These vibrations are too weak or too violent to be measured directly by human senses.
A seismograph is the instrument that detects, records, and measures the vibrations or shaking caused by an earthquake.
It produces a seismogram, which is the recorded trace of the earthquake waves.
The Richter scale is a scale used to express the magnitude of an earthquake, not the measuring instrument itself.
Answer: C. Seismograph