seismometers
/saɪzˈmɑmətərz/
noun
- Instruments that measure and record the movements of the ground, especially during earthquakes.
- The data from the seismometers showed that the earthquake had a magnitude of 6.2.
- Scientists placed seismometers around the volcano to detect any small tremors.
- Modern seismometers are so sensitive they can pick up vibrations from a truck driving nearby.