A seismometer is an instrument that responds to ground noises and shaking such as caused by earthquakes, volcanic eruptions, and explosions. They are usually combined with a timing device and a recording device to form a seismograph.

Who invented the first true seismograph?

The first true seismograph, according to Italian seismologists, was created in 1875 by Italian physicist Filippo Cecchi. The Cecchi seismograph also used pendulums, but it was the first to record the relative motion of the pendulums with respect to Earth's ground motions as a function of time.

Where was the first seismometer invented?

You might be surprised to find, however, that the first seismometer was invented in China in 132 AD by a Chinese astronomer, mathematician, engineer, and inventor called Zhang Heng.