The word 'seismograph' is correct and commonly used in written English.
It refers to an instrument that measures and records earthquakes or other vibrations of the earth. Example: The seismograph detected a 6.5 magnitude earthquake in the Pacific Ocean.
That the lines resemble those on a seismograph picking up a small earth tremor is entirely appropriate: these lines represent tiny ground vibrations made by sounds from above.
That type of seismograph was devised in 1935 by American seismologist Hugo Benioff.
In the case of distant earthquakes or of nearby very large earthquakes, the seismogram pattern is more complicated because it shows various sorts of seismic waves that originate from one or many points but then may be reflected or refracted within Earth's crust before reaching the seismograph.
Ground motions caused by injecting fracking water into underground disposal wells and dynamite blasts in mines, quarries, and public works also can be measured by the seismograph.
The bulk of Lehmann's work at the Seismological Department invlved managing the seismological stations both in Denmark and in Greenland, as well as collecting seismograph information and creating the bulletins associated with the stations.
In 1929, while examining seismograph data collected after a large earthquake in New Zealand, Lehmann noticed that seismographs stationed in the Russian cities of Swerdlowsk (Yekaterinburg) and Irkutsk collected seismic waves with amplitudes that were higher than she had expected.
A record produced by a seismograph on a display screen or paper printout is called a seismogram.
Milne successfully used that seismograph to record several earthquakes in Japan.
The horizontal pendulum seismograph was improved greatly after World War II.
When the period of the pendulum is comparable to that of the ground motion, the seismograph will not exactly record Earth's movement.
Because each kind of movement must be separately recorded, three pendulums, one for each direction, are needed for a complete seismograph.
