Seismographs have been used to study earthquakes for more than 1,800 years. The earliest know seismograph, referred to as a seismoscope, was created by a Chinese philosopher, Chang Hêng, in 132 A.D.

Seismographs have been used to study earthquakes for more than 1,800 years. The earliest know seismograph, referred to as a seismoscope, was created by a Chinese philosopher, Chang Hêng, in 132 A.D.