The destructive energy of an earthquake is measured by the Richter scale. This scale has readings from 1 to 12. A 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, earthquakes having magnitudes higher than 7 are really destructive earthquakes. Destructive energy of an earthquake is measured on the Richter scale. It has readings from 1 to 10. A reading of 3 can be recorded by a seismograph. A reading of 3 can't cause much damage. Generally magnitudes higher than 5 cause damage.