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LIQUEFACTION SUSCEPTIBILITY MAPPING DERIVED FROM TERRAIN MAPPING; EXPERIENCE ON A LINEAR PROJECT IN BRITISH COLUMBIA, CANADA
Session: Earthquakes and Geohazards II / Séismes et géoaléas II
Pete Quinn, BGC Engineering (Canada)
Martin Zaleski, BGC Engineering (Canada)
Roy Mayfield, BGC Engineering (United States)
Hamid Karimian, BGC Engineering (Central African Republic)
Betsy Waddington, BGC Engineering (Canada)
Earthquake-triggered liquefaction and its attendant ground-movement hazards (e.g. buoyancy, subsidence, lateral spreading) may threaten linear infrastructure. Such infrastructure often traverses a range of physiographic, geologic and seismic settings, with varying liquefaction potential. Liquefaction susceptibility maps and the distribution of seismic hazard are typically combined to screen areas for more detailed geotechnical investigations of liquefaction potential. We applied several liquefaction susceptibility classification systems, including Youd and Perkins (1978), to airphoto-based, medium-scale (1:20,000) terrain maps completed in general accordance with Howes and Kenk (1997) for a proposed natural gas pipeline corridor across northern British Columbia, Canada. We compare these maps against site-specific geotechnical and geophysical data to generate statistics relating liquefaction susceptibility categories to the expected thickness of loose, saturated, cohesionless soil. We conclude that medium-scale mapping is reliable for preliminary design level screening, with potential for improvement through larger scale mapping and the compilation of additional subsurface and mapping data.
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