Location: 216 km ESE of Iwaki, Japan Period: 21 Mar 2011 19:01:19 - 22 Mar 2011 13:05:12 (18 hours 3 minutes) Volcanoes in 100km radius: None Earthquakes: 5 3 swarms found nearby. 2011 PS20110312.1(26.1km) 11 Mar 1 day 3 hours 8 earthquakes PS20110315.2(71.4km) 15 Mar 1 day 17 hours 6 earthquakes 2014 PS20140711.1(90.2km) 11 Jul 13 minutes 5 earthquakes