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TitleTwo-dimensional basin-scale seismic site effects in the Kitimat Valley, British Columbia, Canada: A practical example of using a fast hybrid FE/BE method
AuthorAmini, D; Maghoul, P; Perret, D; Gatmiri, B
SourceEngineering Geology (Amsterdam) vol. 311, 106872, 2022 p. 1-18,
Alt SeriesNatural Resources Canada, Contribution Series 20210305
Mediapaper; digital; on-line
File formatpdf
ProvinceBritish Columbia
NTS102; 103
AreaKitimat Valley
Lat/Long WENS-133.0000 -128.0000 56.0000 50.0000
Subjectstectonics; seismic risk; seismicity; seismology; finite element method; basins
Illustrationslocation maps; graphs; schematic representations; tables; plots; models
ProgramPublic Safety Geoscience Intraplate Earthquakes
Released2022 10 23
AbstractThe two-dimensional (2-D) basin-scale seismic site response of the Kitimat valley, located in the North Coast region of British Columbia, Canada, was investigated. The valley was subjected to a synthetic ground motion corresponding to a realistic local crustal earthquake of moderate magnitude consistent with the prevailing seismic hazard in the Kitimat region. SiteQUAKE, a fast hybrid finite element (FE)/boundary element (BE) numerical code was used for analyses, in which linear and equivalent-linear soil behavior models were implemented. The near-field (the sedimentary basin infill) and far-field (surrounding bedrock) were modeled by the FE and BE methods, respectively. Responses at different locations along a cross-section were compared with the input motion to illustrate the importance of basin effects. By dissociating the peak ground responses affected by the sub-surface topography (basin emptied of its infill) and by the presence of the sediment infill, it was shown that one-dimensional (1-D) analyses can either underestimate or overestimate 2-D seismic responses, highlighting their inability and insufficiency to correctly address basin effects.
Summary(Plain Language Summary, not published)
The seismic response of the Kitimat Valley site located in the northern coastal region of British Columbia in Canada is performed using open source software designed for rapid and accurate two-dimensional analyzes. The combined effects of topography, geology and mechanical properties of sediments and rocks are taken into account in the simulations. This study shows that the intensity of movement at the ground surface can be strongly amplified depending on the characteristics of the earthquake.

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