Location: 2004 Parkfield, California Earthquake Period: 28 Sep 2004 11:27:20 - 3 Oct 2004 02:01:06 (4 days 14 hours 33 minutes) Volcanoes in 100km radius: None Earthquakes: 136 1 swarms found nearby. 2004 S20040927.1(0.6km) 26 Sep 82 days 21 hours 2543 earthquakes