In the article the strong 7-point earthquake, occurred on September 4, 2015, at 4 h. 49 m. in the border of Sheki-Oghuz regions is analyzed. The historical earthquakes of the studied area, tectonic structure, peculiarities of epicentral field, focus distribution in depth were studied, the macroseismic  investigations  were held.  The most earthquakes intensity was  observed  in the territories of Gozlubulag,  Yagublu, Turan, Sarich, Chaykarakoyunlu and others, recognized  on the basis of macroseismic investigations.  Seismic focus mechanism was determined  on the base of wideband digital record of seismic waves, registered by 35 telemetry stations. It has allowed to establish  that the earthquakes, occurred in  Oghuz region on September 4, at 4 h. 49 m. and  on October 13, at 00h. 13 m., occurred due to similar compression and tention intensities. The type of main shock motion on both planes is left-lateral fault.