Earthquake sources in the sedimentary thick of Azerbaijan and Caspian sea region

Full text : With the aim to determine the character of earthquakes' sources distribution by the depth and to reveal on this base the peculiarities of seismogenesis and conditions of sources formation within studied region the critical analysis of earthquakes' sources depths of Azerbaijan and Caspian sea region had been carried out in the present paper. Earthquakes' sources spatial distribution by the depth showing in the region their coincidence mainly with depth intervals 0-10 and 15-20 km, this fact allows to assert their connection with sedimentary thick. Thus, this reason gives a reason to suppose it as main structural element within considered area responsible for seismogenesis. Sedimentary thick can be considered as general source of acting stresses from the point of view of mud volcanism and seismicity paragenesis. Comparative description of seismicity temporal distribution within different structural zones of Caspian sea region showed the important role of mud volcanism in seismogenesis that controls the maximum level of seismicity. The peculiarities of earthquakes caused in result of mud volcanoes' eruptions are evidence of reduction reality of seismic hazard through stimulation of different groups mud volcanoes activity.