A seismograph is one such instrument...there might be others.
seismometers (sometimes known as seismographs)
Seismometers
A seismograph is an instrument used to measure seismic waves in the earth's crust. In other words a seismograph detects earthquakes. A tsunami occurs when there is an earthquake at sea. The earthquake causes colossal tidal waves to form and the waves crash onto shore. This is a tsunami.
seismic waves
A seismograph is an instrument that records movements within the earth. A seismogram is the actual recording that scientists look at when studying earthquakes.
Seismic waves occur when there is an earthquake.
The last seismic waves to arrive are surface waves.
A seismometer or seismograph
Seismometer
A seismograph.
A seismogragh is a sensative instrument that records seismic waves.
A seismograph is an instrument used to measure seismic waves in the earth's crust. In other words a seismograph detects earthquakes. A tsunami occurs when there is an earthquake at sea. The earthquake causes colossal tidal waves to form and the waves crash onto shore. This is a tsunami.
scientist use a specail tool called a seismograph wich drows the strength of a seismic wave
seismic waves
Earthquakes generate seismic waves which can be detected with a sensitive instrument called a seismograph.It is an instrument that measures vibration in the Earth.
Seismometer (or seismograph) and it measure seismic waves
A seismometer / seismograph.A seismograph measures and records the waves generated by earthquakes and similar seismic events.
Seismic waves are any waves that travel through the Earth. As such all earthquake waves are seismic waves, however not all seismic waves are caused by earthquakes.
instrument that respond to ground motions such as caused by earthquakes, volcanic eruptions and explosions