Do it yourself. A Chinese method is mentioned below—
Chinese Seismograph Vase Nearly 2000 years ago, the ancient Chinese made a special vase that had several sculpted dragons mounted all around the sides of the vase. Each dragon held in its mouth a metal ball. When the ground shook, some of the balls would fall from the mouths of the dragons into the waiting mouths of the sculpted frog to show how the ground had moved.
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