It’s the largest in a series of quakes to strike along the island’s southern shore in the last 48 hours or so.
The latest, and strongest, hit about 4:24 a.m., damaging a power plant as Puerto Rico’s power authority reported on Twitter. A string of 5.6 and weaker magnitude aftershocks have followed.
While many communications on the island are down in spots along the southern coast where the damage from these quakes has been the heaviest, pictures are rolling in on social media showing damaged buildings.
Effects and power outages are being felt in San Juan, which sits on the northeast coast.