Instrument for Measuring Earthquake Vibrations

The instrument specifically designed to detect and record the ground motion or vibrations during an earthquake is the Seismograph.

Understanding Earthquake Measurement Tools

Different tools are used in seismology, each serving a distinct purpose:

• Seismograph: This is the actual instrument that measures and records the seismic waves (earthquake vibrations). It provides a visual representation called a seismogram.
• Mercalli Scale: This scale measures the intensity of an earthquake based on the observed effects on people, buildings, and the environment. It is a qualitative measure.
• Richter Scale: This scale measures the magnitude of an earthquake, which is related to the energy released. It's calculated using the amplitude of seismic waves recorded by a seismograph.
• Hygrometer: This instrument measures atmospheric humidity and is unrelated to earthquakes.

Therefore, the correct instrument for measuring earthquake vibrations is the Seismograph.