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An earthquake struck Antofagasta, Chile, today, about 800 miles from the capital, Santiago.The preliminary magnitude was 6.3, but has been upgraded to 6.5, according to the U.S. Geological Survey. No tsunamis are expected from the quake. Details from the USGS:

Date-Time:

20 Jun 2011 16:35:57 UTC

20 Jun 2011 12:35:57 near epicenter

Location: 21.945S 68.295W

Depth: 72.7 miles (117 km)

Distances from epicenter:

89 km (55 miles) NE (46 degrees) of Calama, Chile
268 km (166 miles) SE (135 degrees) of Iquique, Chile
287 km (178 miles) NE (49 degrees) of Antofagasta, Chile
1143 km (710 miles) WNW (287 degrees) of ASUNCION, Paraguay

This article will be updated if the event proves significant.