Topix.com-5/21/13, roboblogger
![](http://images.nationalgeographic.com/wpf/media-live/photos/000/000/cache/sf-earthquake_21_600x450.jpg)
A magnitude 6.8 earthquake struck off the coast of Chile on Monday, the US Geological Survey said, but Chilean emergency authorities said they saw no prospect that the tremor would generate a tsunami.
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