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ASSESSMENT OF THE QUALITY FACTOR OF LITHOSPHERE FOR THE LENA DELTA (LAPTEV SEA REGION)
Abstract
The parameters of strong ground motions necessary for seismic hazard assessing of construction sites have pronounced regional differences. In inaccessible and poorly studied areas, the development of a ground motion prediction equation (GMPE) requires determination of regional characteristics of the radiation and propagation of seismic waves, in particular, the quality factor of the lithosphere. This work is devoted to determination of the quality factor and its frequency dependence for the Lena Delta, one of the key areas of the Laptev Sea region, the most seismically active of all Arctic marine regions of Russia. For this purpose, the coda normalization method was used in relation to signals from 5 microearthquakes with Ml > 2, recorded by a temporary local network of seismographs operating in the Lena Delta in 2016-2017. Regional values of quality factor Q = 486-42 were obtained. The scatter of values is probably due to the anisotropy of the environment in the study area. The dependence of the quality factor on frequency is described by the found function Q(f) = 84.328f0.8128. The exponent in this relationship is comparable to the values typical for regions of Mexico, Australia and Canada.
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