CO-SEISMIC LARGE LANDSLIDES IN SENSITIVE CLAY IN EASTERN CANADA, A SEARCH FOR AN INITIATION THRESHOLD
Pete Quinn, Martin Zaleski
In the proceedings of: GeoQuébec 2015: 68th Canadian Geotechnical Conference & 7th Canadian Permafrost ConferenceSession: Landslides and Slope Stability VI / Mouvements de terrain et stabilité des pentes VI
ABSTRACT: This paper examines the search for a peak horizontal ground acceleration (PGA) threshold for triggering co-seismic landslides in sensitive clay in eastern Canada, with the aim of supporting regional risk assessment using HAZUS. Literature sources document a number of small co-seismic landslides associated with small or moderate earthquakes which produced a PGA between about 0.04 g and 0.15 g at the landslide locations. Two papers describe 46 large, co-seismic, sensitive-clay landslides with measured dates. Many of these are associated with the 1663 Charlevoix M7 earthquake, from which site-specific firm ground PGA can be estimated; these range from about 0.03 g to 0.18 g; the remaining landslides are associated with paleo-earthquakes. A clear PGA threshold for triggering large landslides in sensitive clay cannot be inferred from these available data. Earthquake magnitude and distance appear to provide a somewhat better threshold for co-seismic sensitive clay landslides in the study area.
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Quinn, Pete, Zaleski, Martin (2015) CO-SEISMIC LARGE LANDSLIDES IN SENSITIVE CLAY IN EASTERN CANADA, A SEARCH FOR AN INITIATION THRESHOLD in GEO2015. Ottawa, Ontario: Canadian Geotechnical Society.
@inproceedings{Quinn_GEO2015_560,
author = {{Quinn, Pete}, {Zaleski, Martin}}
title = {CO-SEISMIC LARGE LANDSLIDES IN SENSITIVE CLAY IN EASTERN CANADA, A SEARCH FOR AN INITIATION THRESHOLD}
booktitle = {Proceedings of the 68th Canadian Geotechnical Conference & 7th Canadian Permafrost Conference}
year = {2015}
organization = {The Canadian Geotechnical Society},
address = {Ottawa, Canada} }
title = {CO-SEISMIC LARGE LANDSLIDES IN SENSITIVE CLAY IN EASTERN CANADA, A SEARCH FOR AN INITIATION THRESHOLD}
booktitle = {Proceedings of the 68th Canadian Geotechnical Conference & 7th Canadian Permafrost Conference}
year = {2015}
organization = {The Canadian Geotechnical Society},
address = {Ottawa, Canada} }