Correct Answer: richter scale

Solution : The correct answer is Richter scale.

Earthquake or the shaking of the ground is a natural phenomenon in which tectonic plates of the earth moves abruptly, which leads to release of energy at certain point creating seismic waves. The point inside the earth on which earthquake takes place is known as hypocenter and the point just above it on the surface of ground is known as epicenter. It is measured using Richter and Mercalli scale. Richter Scale is used to measure the intensity of the earthquake, where 1 is the least number and it increases with the increase in destruction.