The U.S. Geological Survey said the quake had a preliminary magnitude of 6.4 and struck just after midnight about 35 miles north of Hatillo. It said the quake occurred 17 miles deep.
An earthquake with a magnitude of 3.7 shook Chicago Monday afternoon.
The U.S. Geological Survey said the epicenter of the 4.0 magnitude quake was about 3 miles west of Hollis Center, Maine, and about 3 miles deep.
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