Location of a seismograph represents the star on the map.
Seismograph
seismograph, an instrument that creates a record of seismic waves caused by an earthquake, explosion, or another Earth-shaking phenomenon. Seismographs exist equipped with electromagnetic sensors that translate ground motions into electrical changes, which exist processed and documented by the instruments’ analog or digital circuits.
The seismographs are designed in a way that they slightly have the vibrations of the earth to move the instruments. But the suspended mass does not move but stays at rest, and the recording style observes recording the various motions. The horizontal seismograph usually proceeds in a horizontal plane only. In the issue of vertical seismographs, they include a soft link to the earth with an anchored instrument that breaks the mass. In this way, the mass stays from a spring and absorbs motion generating the mass to stay back in actual action.
Hence, the location of a seismograph represents the star on the map.
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