950 earthquakes have hit Puerto Rico so far this year. Why? Blame it on an 'earthquake swarm'

950 earthquakes have hit Puerto Rico so far this year. Why? Blame it on an 'earthquake swarm'

USATODAY.com

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A 6.4 magnitude earthquake – and 950 smaller ones – have hit Puerto Rico in the first 10 days of January 2020. So why is this happening?

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