Assessment of Seismic Site Response at Hongseong in Korea Based on Two-dimensional Basin Modeling using Spatial Geotechnical Information

서지정보

· 발행기관 : 대한지질공학회
· 수록지 정보 : 지질공학 / 19권 / 1호 / 15 ~ 23페이지
· 저자명 : 선창국

초록

The site effects relating to the amplification of ground motion under earthquake loading are strongly influenced
by both the subsurface soil condition and geologic structure. In this study, the site effects at the Hongseong area in
Korea were examined by both the site investigation including borehole drilling and in-situ seismic tests and the site
visit for acquiring geologic information of ground surface. Subsurface of Hongseong area with a major instrumental
earthquake event in 1978 is composed of weathered layers of a maximum of 45 m thickness overlying bedrock. A
geotechnical information system based on GIS framework was implemented to effectively find out spatial geologic
structure of study area and it indicated Hongseong is a shallow and wide shaped basin. Two-dimensional finite element
(FE) analyses for a representative cross-section of the Hongseong area were performed to evaluate seismic site
responses. From the results of seismic responses, it was observed that the ground motions were amplified during the
propagation of shear waves through the soil layer overlying the bedrock and the duration of shaking near the basin
edges was prolonged due to the surface waves generated by interactions of shear waves with basin geometry. Furthermore,
one-dimensional FE seismic response analyses were additionally conducted for soil sites selected in the basin,
and it gives similar results to the two-dimensional seismic responses at most locations in the basin with the exception
of the locations near the basin edges, because the basin in this study is very shallow and wide.

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