Question

write about sesimogram
its working​

Answer 1

A seismograph is a device for measuring the movement of the earth, and consists of a ground- motion detection sensor, called a seismometer, coupled with a recording system.

Seismographs operate on the principle of inertia

Seismometers used in earthquake studies are highly sensitive to ground movements, so that movements as small as 1/10,000,000 centimeters (distances almost as small as atomic spacing) can be detected at very quiet sites.

Modern research seismometers are electronic, and detect and record motions in all directions

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