Local intensity of an earthquake that triggered Quyon valley landslide 1020 cal BP

B. Wang

In the proceedings of: GeoVancouver 2016: 69th Canadian Geotechnical Conference

Session: GEOHAZARDS - I Climate Change Floods & Landslides

ABSTRACT: Geotechnical studies were carried out to determine the seismic loading required to trigger the enormous prehistoric landslide near Quyon, southwestern Quebec. The landslide occurred in Champlain Sea sediments and was previously hypothesized to be triggered by a paleoearthquake at ~1020 cal BP. Field test results indicate that the soil undrained shear strength increases linearly with depth. A slip surface was delineated from CPT data to be about 20 m to 45 m below the original surface. Limit equilibrium models were constructed for slope stability analyses of one longitudinal section and six cross-sections. The minimum seismic load (horizontal ground acceleration) required to cause slope failure was determined to be 0.27 g. The longitudinal and cross-sectional models resulted in the same threshold seismic load. The findings support a hypothesis of a complex slope failure mechanism.

RÉSUMÉ: Des études géotechniques ont été réalisées afin de déterminer la charge sismique qui a été nécessaire au déclenchement de l-ouest du Québec. il aurait été provoqué par un paléoséismeindiquent que la résistance au cisaillement sans consolidation du sol augmente de façon linéaire en fonction de la données des essais au pénétromètre à cône (EPC) comme étant de 20 à 45 des analyses de la stabilité des pentes pour une coupe longitudinale et six coupes transversales. La charge sismique minimale (accélération horizontale du sol) nécessaire pour causer la rupture de versant a été établie à 0,27 g. Les

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Cite this article:
B. Wang (2016) Local intensity of an earthquake that triggered Quyon valley landslide 1020 cal BP in GEO2016. Ottawa, Ontario: Canadian Geotechnical Society.

@article{3684_0811123924,author = B. Wang,title = Local intensity of an earthquake that triggered Quyon valley landslide 1020 cal BP,year = 2016}