The analysis of the data on geodynamics of gas-oil deposits of the world has shown, that engineering activity becomes the essential provoking factor breaking seismogeodynamic and geochemical condition of environment (Simpson et all, 1986, Grasso et all, 1992, Plotnikova etc., 1999). In some cases technogenic impacts cause change of level of seismic hazard and increase seismic risk level for objects. On the basis of generalization of the data by different regions of the world about the mechanism of technogenic impact in different geologic-tectonic conditions, we earlier offered a technique of the forecast of kinematic and dynamic parameters of probable triggered earthquakes in conditions of the accepted technology of exploration of gas-oil deposit. The technique provides the organization of long-term system of geophysical and seismological monitoring behind course of geodynamic process in area and creation of geoinformation system (GIS) which includes data base of the geologic - tectonic, geophysical, hydrodynamical and seismological data, and also parameters of technology of exploration of deposit. A task of monitoring - the control of balance between endogenic and technical influences and the seismic response of environment, choice on the basis of the current data of an optimum mode of operation of the deposit providing reduction of seismic risk and ecological safety of objects.

For the solution of seismotomograhic task we used arrival times of waves of 560 earthquakes at 16 seismic stations Complex seismological expedition of Institute of Seismology ANRUz. Layered velocity maps of seismic waves are obtained for depths: 1.5 km, 3 km, 11.4 km, 23.6 km, 35.9 km.

In result we find out, that practically for all considered territory of the Western Uzbekistan it is typical existence of extensive zones of low velocity of waves propagation in interval of depths of 1-35.9 km. The arrangement of such zones in some borders is frequent. Besides low velocity zones for deep section of territory exists areas with high values Vр = 6,8-7,4km/sec typical, which correspond to larger depth. These zones appears mainly in areas of mountain ridges Tamdy, Kuldjuktau, Bukantau, but the abnormal zone steadily defined also in Syrdarya depression.

Comparison of seismotomographic sections with map of magnetic anomalies of the Western Uzbekistan and map of epicentres of earthquakes has shown, that on shifts and sharp bends of strips of magnetic anomalies it is possible to judge young tectonic faults and about distance of horizontal motions along them. Distribution of the centers of the earthquakes occured in zone of their influence can testify modern tectonic activity of cross zones of faults of Antityanshan direction. More detailed cross-section were obtained for the region of gas field Gazli and compared with focuses of small events, occuring in vicinity of gas field. We intend to analyze it jointly with parameters of hydrodynamic regime and technology of exploration of gas field.