SEISMIC WAVE ATTENUATION IN THE LITHOSPHERE OF PRIAMURYE

We present the results of determining the attenuation parameters of seismic waves (seismic quality factor at a frequency of 1 Hz Q0 and frequency parameter n) in the lithosphere of Priamurye. We estimated the attenuation parameters on a regional scale using code of Lg surface waves, as well as their key and strongest spatial variations. The Q0 parameter varies from 380 in southern Primorye to 600 in northwestern Priamurye. Based on the code of body S-waves from nearby earthquakes recorded at the stations of the local seismological network of the Bureyskaya Hydropower Plant, we obtained the average estimates of the quality factor and frequency parameter for a region with a radius of a few hundred kilometers around the hydropower plant. For a window width of 20 s, Q0 = 103 and n = 0.806. These values are typical for the regions with moderate seismicity and confirm the significant seismic potential of the territory. The use of the information about actual attenuation parameters of seismic waves makes it possible to more accurately and more understandably relate the parameters of the sources of hypothetical earthquakes and the expected intensity of ground shaking caused by them, and thereby eliminates one of the significant simplifications inherent in general seismic zoning maps.