∙ The destructive energy of an earthquake is measured by the Richter scale. This scale has the readings from 0 to 9.
∙ 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.
∙ And finally, earthquakes having magnitudes higher than 7 are destructive earthquakes.