In this photo taken Nov. 29, 2012, students participate in a quake evacuation simulation in Navidad, Chile. This small coastal community some 100 miles (170 kilometers) from the capital Santiago, has been hit by a quick succession of more than two dozen tremors in recent weeks. Seismologists say they could be aftershocks of a devastating earthquake two years ago, or a warning for the next big disaster. (AP Photo/Luis Hidalgo)

Associated Press
In this photo taken Nov. 29, 2012, students participate in a quake evacuation simulation in Navidad, Chile. This small coastal community some 100 miles (170 kilometers) from the capital Santiago, has been hit by a quick succession of more than two dozen tremors in recent weeks. Seismologists say they could be aftershocks of a devastating earthquake two years ago, or a warning for the next big disaster. (AP Photo/Luis Hidalgo)
In this photo taken Nov. 29, 2012, students participate in a quake evacuation simulation in Navidad, Chile. This small coastal community some 100 miles (170 kilometers) from the capital Santiago, has been hit by a quick succession of more than two dozen tremors in recent weeks. Seismologists say they could be aftershocks of a devastating earthquake two years ago, or a warning for the next big disaster. (AP Photo/Luis Hidalgo)
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