A seismogram is a record of an earthquake that's obtained from a seismic instrument. It's in the form of a graph.
siesmograph
"Shake, Rattle, and Roll". But seriously folks, it's called a "seismogram".
Seismographs record the arrival time and amplitude of seismic waves. They can be used to locate the earthquakes epicentre and estimate the earthquake's magnitude. Please see the related question.
The basic concept of seismic instruments is to record vibrations. Older machines use paper, ink, and a drum to record the level of vibrations.
A seismograph is an instrument that measures the seismic wave activity in an area. According to Wikipedia, Seismometersare instruments that measure and record motions of the ground, including those of seismic waves generated by earthquakes, nuclear explosions, and other seismic sources. Records of seismic waves allow seismologists to map the interior of the Earth, and locate and measure the size of these different sources. A seismic wave, according to wikipedia is, "Seismic waves are waves of force that travel through the Earth or other elastic body, for example as the result of an earthquake, explosion, or some other process that imparts forces to the body. Seismic waves are also continually excited on Earth by the incessant pounding of ocean waves (referred to as the microseism) and the wind."Seismograph is another Greek term from seismós and γράφω, gráphō, to draw. It is often used to mean seismometer, though it is more applicable to the older instruments in which the measuring and recording of ground motion were combined than to modern systems, in which these functions are separated. Both types provide a continuous record of ground motion; this distinguishes them from seismoscopes, which merely indicate that motion has occurred, perhaps with some simple measure of how large it was.
a seismograph
Stestmophology
this is where the seismic waves recorded; measures vertical earth motion
To try to predict earthquakes, and get advanced warning of them.
htr
the ground movement caused by seismic waves
On the drum of a seismic recorder, the pen moves up or down according to the earthquake waves reaching it, giving a 2D record.
seismogram
it records the frequency of the earthquake !
seismic waves
Seismometer (or seismograph) and it measure seismic waves
At many different earthquake centers. When an earthquake happens the tree nearest earthquake centers record the magnitude and intensity of the seismic waves produced by the earthquake in order to find the origin or epicenter
Seismograph ;) (listen in your science class!)