Most residents of southern Puerto Rico were startled by the sequence of earthquakes that began Dec. 28, 2019 and included a magnitude 6.4 quake on Jan. 7, 2020. Now, USGS researchers have newly discovered deep sea faults near the quake epicenters… Most residents of southern Puerto Rico were startled by the sequence of earthquakes that … Continue reading New Seafloor Faults Discovered Near Puerto Rico Quakes’ Epicenters