What s the difference between magnitude and intensity?
Magnitude is a measure of the size of an earthquake and can be related to the amount of energy released at the focal point. It can be likened to the power of radio or television waves sent out from a broadcasting station. Intensity is how well you receive the signal, which can depend on your distance from the energy source, the local conditions, and the pathway the signal has to take to reach you. Intensity is measured on the Modified Mercalli scale a 12-point scale that represents the intensity of ground-shaking, or destructiveness of an earthquake. Mercalli, an Italian seismologist, developed the scale in the early 20th century. It was later modified to suit building standards in California. New Zealand scientists have modified it further to suit New Zealand conditions. It is used by scientists, engineers, architects, planners, and insurance companies who need to know the relationship between the strength of shaking at ground level and the degree of damage. There is no linear relatio
