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IQUIQUE, Chile (AP) - The U.S. Geological Survey says a powerful 7.8-magnitude aftershock has rocked Chile's northern coast, which was hit by a powerful magnitude-8.2 earthquake Tuesday night.

Story:Troops keep order in northern Chile after quake kills 6

It caused buildings to shake in the port of Iquique, which saw some damage from the big quake on Tuesday. There are no immediate reports of new damage or injuries.

The latest tremor came 45 minutes after a strong 6.4-magnitude aftershock shook the same area.

The stronger aftershock's epicenter was 14 miles (23 kilometers) south of Iquique. The USGS said the aftershock had a depth of 12 miles (20 kilometers).

A powerful 7.6-magnitude earthquake strikes off northern Chile, but there are no reports of damage and a precautionary tsunami alert along the coast and in neighboring Peru is called off. Sarah Toms reports.

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