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Geotechnical investigations of an earthquake that triggered disastrous landslides in eastern Canada about 1020 cal BP
Geoenvironmental Disasters Pub Date : 2020-06-24 , DOI: 10.1186/s40677-020-00157-9
Baolin Wang

Geotechnical studies are carried out to investigate the location and magnitude of a prehistoric earthquake in eastern Canada. Previous studies identified 12 sensitive clay landslides of about 1020 cal BP in the Ottawa-Gatineau region, including one of the most disastrous slope failures in eastern Canada. The landslides were hypothesized to have been triggered by an earthquake. In the current study, three of those landslides are investigated to understand their failure mechanisms. The study sites form a triangle of lateral distances of about 38, 38 and 35 km. Micro-seismic surveys, cone penetrometer tests, vane shear tests, soil sampling and laboratory testing are conducted to collect geotechnical data. Slope stability models are constructed to calculate threshold ground accelerations required to trigger the landslides. The ground accelerations are used with Ground-Motion Prediction Equations to triangulate the earthquake. The results indicate an earthquake of a minimum moment magnitude of 5.9 near Eardley, Quebec.

中文翻译:

地震在加拿大东部约1020 cal触发地震灾难性山崩的岩土工程研究

进行了岩土研究以调查加拿大东部史前地震的位置和强度。先前的研究在渥太华-加蒂诺地区发现了12个大约1020 cal BP的敏感粘土滑坡,其中包括加拿大东部最灾难性的斜坡破坏之一。假定滑坡是由地震触发的。在当前的研究中,对其中三处滑坡进行了调查,以了解其破坏机理。研究地点形成一个约38、38和35 km的横向距离的三角形。为了收集岩土数据,进行了微地震勘测,锥形渗透计测试,叶片剪切测试,土壤采样和实验室测试。构建了边坡稳定性模型,以计算触发滑坡所需的阈值地面加速度。地面加速度与“地面运动预测方程”一起使用,对地震进行三角测量。结果表明,在魁北克Eardley附近发生的最小矩震级为5.9的地震。
更新日期:2020-06-24
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