Select the option that can be used as a one-word substitute for the given group of words.

An instrument for detecting an earthquake

Seismograph

The word that can be used as a one-word substitute for an instrument for detecting an earthquake is seismograph.

• Electrograph is an instrument that records electrical activity.
• Spectrograph is an instrument that separates light into its component wavelengths.
• Magnetograph is an instrument that measures the strength and direction of a magnetic field.