Working of a Seismograph Video Lecture | Science Class 8

how a seismograph works a seismograph is
an instrument used to measure the
movement of earthquakes a weight is
suspended in a way that allows it to
remain still when the ground moves most
modern instruments use an
electromagnetic mechanism for this a
writing instrument is attached to the
weight allowing it to record the
movement as it happens the word RAF
refers to the writing action most modern
earthquake monitoring uses seismometers
not seismographs and record the movement
of the earth digitally or output the
data to a seismogram a printed version
of the wavelengths on a large drum these
wavelengths that represent Earth's
movements are so small that in order for
scientists to study them they have to be
amplified
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