Question

how do we detect earthquake by seismograph?​

Answer 1

Explanation:

Seismometers allow us to detect and measure earthquakes by converting vibrations due to seismic waves into electrical signals, which we can then display as seismograms on a computer screen. Seismologists study earthquakes and can use this data to determine where and how big a particular earthquake is.

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Answer 2

Explanation:

We measure magnitude.This is shown on a Richter scale.