Development of regional site amplification models for eastern canada

蒙特利尔和渥太华位于活跃的魁北克西部地震带，这使它们面临地震危险。潜在的风险最近在2010年6月23日发生的5.0级地震中突显出来，该地震位于渥太华市东北约50公里处。这场地震在渥太华位于软冰期后沉积物上的地区有强烈的震感，这放大了地震震动的程度。土壤放大可以显著影响地震事件的地面运动和危害；最新版本的加拿大国家建筑规范(2005)认识到它的重要性，采用地震场地分类系统来确定土壤放大系数。 过去的初步研究结果表明，加拿大国家建筑规范给出的地震土壤放大系数主要基于加州的数据库，由于该地区独特的冰后沉积地质和岩土条件，不适合加拿大东部。渥太华地区的地震记录表明，相对于岩土工程实践中使用的典型放大系数，土壤放大系数很大。 拟议的跨学科研究将为加拿大东部的不同场地类别提供一个独特的特定地区地震土壤放大模型。这项研究将与加拿大地震研究网络(CSRN)的补充工作联系起来。CSRN强调，开发特定区域的地震土壤放大系数是降低加拿大城市地震风险的重要因素。 拟议研究的结果将有助于更好地了解土壤对强烈地震运动的放大行为；长期计划是为加拿大东部提供特定地区的地震土壤放大系数，这将对指导加拿大国家建筑法规未来版本的改进和具体场地的研究产生影响。

The location of Montreal and Ottawa in the active Western Quebec seismic zone places them at risk of seismic hazards. The potential risk was recently highlighted with the magnitude M5.0 earthquake on June 23, 2010, located about 50 km northeast of the city of Ottawa. This earthquake was felt strongly in areas of Ottawa that are located on soft postglacial sediments, which amplified the level of earthquake shaking. Soil amplification can significantly influence the ground motions and hazards of seismic events; and, the most recent version of the National Building Code of Canada (2005) recognizes its importance with a seismic site classification system to determine soil amplification factors. The results of past pilot research indicate that the seismic soil amplification factors given by the National Building Code of Canada, which are mainly based on the Californian database, are not adequate for Eastern Canada, due to the unique geological and geotechnical conditions of postglacial sediments in the region. Earthquake recordings in the Ottawa region show that the soil amplification is large relative to the typical amplification factors being used in geotechnical practice. The proposed interdisciplinary research will provide a unique region-specific model of seismic soil amplification for different site classes in Eastern Canada. The research will be linked with complementary efforts by the Canadian Seismic Research Network (CSRN). CSRN has emphasized that the development of region-specific seismic soil amplification factors is an important element for the reduction of urban seismic risk in Canada. Results of the proposed research will lead to an improved understanding of soil amplification behaviour to strong seismic motions; and, the long-term plan is the provision of region-specific seismic soil amplification factors for Eastern Canada, which will be influential in guiding improvements for future versions of the National Building Code of Canada and for site-specific studies.