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http://dx.doi.org/10.7843/kgs.2014.30.10.67

Seismic Amplification Characteristics of Eastern Siberia  

Park, Du-Hee (Dept. of Civil and Environmental Engrg., Hanyang Univ.)
Kwak, Hyung-Joo (Dept. of Civil and Environmental Engrg., Hanyang Univ.)
Kang, Jae-Mo (Korea Institute of Construction Technology)
Lee, Yong-Gook (Dept. of Civil and Environmental Engrg., Hanyang Univ.)
Publication Information
Journal of the Korean Geotechnical Society / v.30, no.10, 2014 , pp. 67-80 More about this Journal
Abstract
The thickness of permafrost in Eastern Siberia is from 200 to 500 meters. The seasonally frozen layer can vary from 0 to 4m depending on ground temperature and its location. The shear wave velocity varies from 80m/s in summer to 1500m/s in winter depending on soil type. When melted, large impedence will occur due to the difference between the shear wave velocity of seasonally frozen soil and that of permafrost layer. Large displacement may occur at the boundary of the melted and the frozen layer, and this phenomenon should be considered in a seismic design. In this research, one-dimensional equivalent linear analyses were performed to investigate the effects of the seasonally frozen layer on ground amplification characteristics. Soil profiles of Yakutsk and Chara in Eastern Siberia were selected from geotechnical reports. 20 recorded ground motions were used to evaluate the effect of input motions. As the thickness of seasonally frozen layer and the difference in the shear wave velocity increases, the amplification is shown to increase. Peat, very soft organic soil widely distributed throughout Eastern Siberia, is shown to cause significant ground motion amplification. It is therefore recommended to account for its influence on propagated motion.
Keywords
Seasonally frozen layer; Pemafrost; Site response analysis; Eastern Siberia; Amplification factor;
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