Photo: Were Last Week's Pacific Earthquakes Connected?



Earthquakes big and small, depicted as squares on a USGS map, struck south of the Samoan islands between September 25 and October 2, 2009.

In a four-day period during that time span, big quakes also hit two other regions along the Pacific's seismically active Ring of Fire. The back-to-back earthquakes may—or may not—have set each other off, experts say.


Maps courtesy USGS


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