Puerto Rico Earthquakes 2011: 2 Strike Saturday, Totaling 4 in 3 Weeks

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Two comparatively strong earthquakes struck Puerto Rico within three minutes of each other early Saturday, according to the U.S. Geological Survey. There have been no media reports of damage, injuries, or death.

The first quake was magnitude 5.1, and the second was magnitude 5.3. The temblors shook the island shortly after 3 a.m. EST (2 a.m. AST). Reports say one of the several aftershocks that came minutes later was felt in the territorial capital of San Juan.

The 5.1 quake happened at a depth of 14 kilometers (9 miles), while the 5.3 quake occurred at a depth of 17 kilometers (11 miles), according to ABCNews.com, drawing on USGS data. The epicenters of both were about 12 to 13 miles southwest of Stella, the USGS reported.

No tsunami alert was issued since the U.S. West Coast and Alaska Tsunami Warning Center believed the quakes weren't strong enough to create a tsunami, according to the Malaysian Star.

Some residents of Puerto Rico's southwestern region said that there were power outages as well as broken items around their houses, ABCNews.com reported.

Saturday's quakes were stronger than a pair of early-morning earthquakes that struck the island and other parts of the Caribbean basin on Nov. 28.

On that occasion, the first quake had a magnitude of 4.9 with its epicenter in the Atlantic Ocean about 60 kilometers (40 miles) north of the town of Hatillo, while the second quake -- striking about a half hour later -- had a magnitude of 4.7 with its epicenter about 55 kilometers (35 miles) east of St. Martin.

There were no reports of either damage or injuries related to those quakes, either, according to msnbc.com

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