Location: 13 km NNE of West Richland, Washington Period: 4 Sep 2011 01:25:37 - 7 Sep 2011 15:15:09 (3 days 13 hours 49 minutes) Volcanoes in 100km radius: None Earthquakes: 47 3 swarms found nearby. 2009 S20090308.1(1.1km) 7 Mar 23 days 2 hours 494 earthquakes S20090403.1(1.6km) 2 Apr 13 days 17 hours 278 earthquakes S20090512.1(1.9km) 12 May 8 days 9 hours 221 earthquakes