The Intensity of an earth quake refers to the noticeable and severity effects of damage on man made structures, natural(crops and livestock) and human life at different locations. To measure the intensity of an earthquake, the Modified Mercalli Intensity Scale is used and consists of 12 levels of intensity(in roman numerals) that rank the extent of damage based on observable effects with the higher levels based on structural damage.
A Level I -V1 Intensity on the scale will show slight damages to properties and treatable injuries to people, but going higher on the scale above VI shows total damage and destruction to structures and human life.