Location: 143 km ESE of Katsuura, Japan Period: 22 Sep 2016 15:56:05 - 23 Sep 2016 10:28:20 (18 hours 32 minutes) Volcanoes in 100km radius: None Earthquakes: 8 3 swarms found nearby. 2005 PS20050119.1(33.5km) 19 Jan 10 hours 6 earthquakes PS20050121.1(52.7km) 20 Jan 1 day 3 hours 8 earthquakes 2011 PS20110311.2(88.7km) 11 Mar 21 hours 21 earthquakes