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seismographs [2]click to hear

Instruments that record seismic wave amplitude at a given point on the Earth’s surface.
seismographs [2] horizontal seismograph seismogram horizontal ground movement rotating drum mass pen

horizontal seismograph click to hear

Instrument that measures horizontal ground movements.

seismogram click to hear

Graphic representation produced by a seismograph; the stronger the tremors, the greater the oscillations on the paper.

horizontal ground movement click to hear

rotating drum click to hear

Secured to the ground, it rotates under the pen, recording ground movements on paper.

mass click to hear

Independent of ground movement, it remains stationary during an earthquake, thus serving as a reference for measuring the amplitude of tremors.

pen click to hear

Writing instrument that converts ground movement into a line.