Location: 2 km WNW of Boumerdas, Algeria Period: 21 May 2003 19:57:11 - 22 May 2003 19:02:38 (23 hours 5 minutes) Volcanoes in 100km radius: None Earthquakes: 25 1 swarms found nearby. 2003 PS20030521.1(41.9km) 21 May 19 hours 9 earthquakes