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seismographs click to hear : seismographs

Instruments that record seismic wave amplitude at a given point on the Earth’s surface.
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See seismographs in : french | spanish
horizontal seismograph seismogram horizontal ground movement rotating drum mass pen

horizontal seismograph click to hear : horizontal seismograph

Instrument used to measure horizontal ground movements.

seismogram click to hear : seismogram

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

horizontal ground movement click to hear : horizontal ground movement

rotating drum click to hear : rotating drum

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

mass click to hear : mass

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 : pen

Writing instrument that converts ground movement into a line.