Many people are often surprised by the smaller earthquakes that take place after the main earthquake. Aftershocks take place in the same region as the original earthquake but are always smaller in magnitude. Aftershocks form as the crust around the displaced fault plane adjusts to the effects of the main shock. The size of the aftershock may help figure out the range of land affected by the main earthquake. Aftershocks tend to be dangerous because they are unpredictable and can cause buildings to collapse that were weakened by the main shock.
I am having trouble uploading a picture but here are some links to a few:
http://www.neophobic.ro/art_img/adeline/28042009205008/earthquake2.jpg
http://heavenawaits.files.wordpress.com/2008/05/kobe_earthquake.jpg
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