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Algeria suffered frequently from effects of destructive moderate sized and strong earthquakes because of the seismotectonic setting on the boundary of African and Eurasian tectonic plates. On May 14th, 2010 at 13 h 29 m GMT, a moderate earthquake of magnitude Md 5.2 (CRAAG – Algeria) struck Beni-Illmane a village located about 200 km southeast of Algiers. The main shock caused substantial damage and resulted in three fatalities, 86injured, 1720out of shelter families and 6431 constructions damaged. The main shock was followed by a significant number of aftershocks for days after the earthquake. The Beni-Illmane earthquake sequence, which started on May 14th, 2010, occurred in a region of low to moderate seismic activities in north Algeria. Following the first main shock, the CGS – Algeria acted and organized a seismic survey of aftershocks using 13 temporary seismic stations installed close to the epicentral area during 30 days recording period. The data were analyzed performing single events location, relocated using MJHD method and calculated composite focal mechanism solution. The results obtained showed a distribution of aftershocks in two clusters oriented NNE-SSW and east-west. The composite focal mechanism showed a strike slip fault consistent with the global CMT solution.
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The data were analyzed using Seisan program. Chatelain method was used for data quality control of the phase picking. Using Hypocenter program the single event localization was performed than used for the MJHD relocalization. Composite focal mechanism solution was calculed.
