Seismograph ;)
(listen in your science class!)
seismic waves
Seismometer (or seismograph) and it measure seismic waves
A seismograph.
seismogram-
Semogram
Seismic waves are measured by seismographs, geophones, hydrophones and accelerometers.
Seismic waves
To try to predict earthquakes, and get advanced warning of them.
A seismogragh is a sensative instrument that records seismic waves.
A seismometer or seismograph
the ground movement caused by seismic waves
seismologists