World Academy of Science, Engineering and Technology, International Journal of Geological and Environmental Engineering, Oct 26, 2015
The slow coming together between the afro-Eurasia plates seems to be the main cause of the active... more The slow coming together between the afro-Eurasia plates seems to be the main cause of the active deformation in the whole of North Africa which in consequence come true in Algeria with a large zone of deformation in an enough large limited band, southern through Saharan atlas and northern through tell atlas. Maghrebin and atlasian chain along North Africa are the consequence of this convergence. In junction zone we have noticed a compressive regime NW-SE with a creases-faults structure and structured over thrust. From a geological point of view the north part of Algeria is younger then Saharan platform, it’s changing so instable and constantly in movement, it’s characterized by creases openly reversed, over thrusts and reversed faults, and undergo perpetually complex movement vertically and horizontally. On structural level the north of Algeria it's a part of erogenous alpine peri-mediteranian and essentially the tertiary age It’s spread from east to the west of Algeria over 1200 km .This oogenesis is extended from east to west on broadband of 100 km .The alpine chain is shaped by 3 domains: tell atlas in north, high plateaus in mid and Saharan atlas in south In extreme south we find the Saharan plat form which is made of Precambrian bedrock recovered by Paleozoic practically not deformed. The Algerian north and the Saharan plat form are separated by an important accident along of 2000km from Agadir (Morocco) to Gabes (Tunisian) The seismic activity is localized essentially in coastal band in north of Algeria shaped by tell atlas, high plateaus, Saharan atlas. Earthquakes are limited in the first 20km of the earth's crust; they are caused by movements along faults of inverted orientation NE-SW or sliding tectonic plats -The center region. It characterize Strong Earthquake Activity who locate mainly in the basin of Mitidja (age Neogene).The southern periphery (Atlas Blideen) constitutes the June, more Important seism genic sources in the city of Algiers and east (Boumerdes region). -The North east-region. It is also part of tellian area, but it is characterized by a different strain in other parts of northern Algeria. The deformation is slow and low to moderate seismic activity. Seismic activity is related to tectonic -slip earthquake. The most pronounced is that of 27 October 1985 (Constantine) of seismic moment magnitude Mw = 5.9. -North -West region. This region is quite active and also artificial seismic hypocenters which does not exceed 20km.
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