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CLEVELAND - The planet Earth is always in motion.

A series of tectonic plates glide across the Earth's crust to form the continents you see them on today's maps. Where these plates come together, we see the focal points of many of the world's earthquakes as these slabs of earth move under one another or move side by side. Pressure builds until the ground suddenly moves and an earthquake is born.

However, a quake is usually followed by a number of smaller quakes called aftershocks. But what is the difference?

The difference is in the intensity of the quake. The initial quake always has the greatest power, or magnitude, as defined by the Richter scale. Aftershocks are smaller quakes that then occur in the general area after the main quake. These earth movements can continue until the crust readjusts to changes caused by the movement of rock.

Hundreds or even thousands of aftershocks can follow a major quake as in the case of the 8.2 magnitude quake off the coast of Iquique, Chile, where small quakes have continued since April 1st. These quakes of lesser intensity will continue to be called aftershocks until the activity returns to a normal state in that area which could take weeks or months.

Lesser intensity earthquakes can also have aftershocks, but are usually limited in nature.

Follow Frank Macek on twitter at http://www.twitter.com/frankmacekwkyc

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