A seismograph is located under the ground. When there is an earthquake, the ground shakes, which also shakes the pen on the seismograph, making it move along the paper, drawing lines. To know how strong the earthquake was, scientist can look on the paper. The bigger the lines, the stronger the earthquake was.
Seismometers. For information on how seismometers are used, please see the related question.
A seismograph is used to measure ground movement or vibrations on the Richter scale.
A seismograph.
seismograph
Seismograph
The correct spelling (transposed) is seismograph(measures and records seismic activity).
Lilly, who is a scientist, used a seismograph to determine the strength of the earthquake that had just hit Haiti.
it records the magnitude of earthquakes.
seismograph scale
Seismograph.
a seismograph
a seismograph