Location: 27 km SE of El Negro, Puerto Rico Period: 2 Sep 2016 13:26:59 - 6 Sep 2016 17:28:21 (4 days 4 hours 1 minute) Volcanoes in 100km radius: None Earthquakes: 108 1 swarms found nearby. 2016 S20161112.1(2.9km) 11 Nov 1 day 0 hours 31 earthquakes