Chilean quake among top 10 strongest on record

The 8.8 magnitude earthquake that slammed central Chile on Saturday is among the top 10 strongest on record, according to data from the US Geological Survey, which monitors earthquakes around the world.
Eighteen of the top 20 most powerful earthquakes, including the strongest, struck in a zone of volcanic instability that encircles the Pacific Ocean known as the "Ring of Fire."The "Ring" stretches along the western coast of the Americas through the island nations of the South Pacific and on through Southeast Asia....

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