Geophysical processes and biosphere: article

Аnnotation: We have been mapping short-period shear wave attenuation field in the lithosphere of the North Tien Shan. We analyzed seismograms of local earthquakes and quarry blasts, recorded by five stations installed in the area of Almaty city and its close environs (including the place of nuclear reactor WWR-K. Characteristics of common S coda envelopes for various sectors relative to seismic stations are described. Sections of the attenuation field for the stations considered are constructed. Characteristics of the attenuation field to the north of Zaili deep fault zone (at the southern outskirt of Kazakh platform) and to the south of it (in mountain areas) are compared. This allows us to make conclusions on difference of deep-seated fluid content in these areas. We created maps of the attenuation field in various depth ranges and at different azimuths for all stations. We found zones of the highest attenuation, where processes of large earthquake nucleation could occur. Recommendations are given for installation of additional stations for more operative and accurate determining epicenter location of possible earthquake and estimating its magnitude to take measures for the safety of the nuclear reactor WWR-K.