Eleven earthquakes ranging from 2.8 to 5.6 magnitudes were reported off Oregon's southern coast Tuesday morning, according to the U.S. Geological Survey.
The quakes, on average, were clustered about 126 miles west of Crescent City, California. No tsunami warnings were announced.
Don Blakeman, a geophysicist at the National Earthquake Information Center, said the magnitudes haven't yet been serious, adding that quakes of this caliber occur fairly often off the coast.
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