The flurry of quakes in Puerto Rico’s southern region began the night of Dec. 28. Victor Huerfano, director of Puerto Rico’s Seismic Network, told The Associated Press that shallow quakes were occurring along three faults in Puerto Rico’s southwest region: Lajas Valley, Montalva Point and the Guayanilla Canyon.

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He said the quakes overall come as the North American plate and the Caribbean plate squeeze Puerto Rico.

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One of the largest and most damaging earthquakes to hit Puerto Rico occurred in October 1918, when a magnitude 7.3 quake struck near the island’s northwest coast, unleashing a tsunami and killing 116 people.

The Associated Press contributed to the report.