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The seismometers are instruments that measure volcanic eruptions and seismic waves on the planet. It is formed by a fixed pendulum with a needle. The needle writes in a paper roll the movements of the earth. Depending on waves size, we can see the strength and duration of the earthquake. This measurement tool is used by geologists. There are three types: mechanical, electromagnetic and broadband. Thanks to these devices, we can avoid some catastrophes or at least reduce the damage.