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Answer :
The destructive energy of an earthquake is measured by the Richter scale.
This scale has readings from 1 to 10.
Seismograph can measure an earthquake of magnitude 3 on the Richter scale.
If the Richter scale gives a reading of magnitude 3, then the earthquake is not likely to cause much damage. Generally, earthquakes of magnitude, higher than 5 is considered destructive in nature.