Name the scale on which the destructive energy of an earthquake is measured. An earthquake measure 3 on this scale. Would it be recorded by a seismograph? Is it likely to cause much damage?

The magnitude or the intensity of an earthquake is measured on Richter Scale.

The reading of magnitude 3 on the Richter scale would be recorded by a seismograph.

If the Richter scale gives a reading of magnitude 3, then the earthquake is not likely to cause much damage. Generally, earthquake of magnitudes higher than 5 is considered destructive in nature.