The largest earthquake in Puerto Rico in 100 years struck on a fault discovered only several years ago. The swarm-like earthquake sequence, with a M5.8 foreshock and two large aftershocks so far, caused extensive damage and, unfortunately, is not over. On December 28, 2019, the southwestern region of the island of Puerto Rico — located … Continue reading Puerto Rico’s 2019-2020 Seismic Swarm Continues and Leaves the Island on Edge More