Journal
QUATERNARY RESEARCH
Volume 80, Issue 3, Pages 425-434Publisher
CAMBRIDGE UNIV PRESS
DOI: 10.1016/j.yqres.2013.07.008
Keywords
Landslide; Sensitive sediments; Radiocarbon chronology; Holocene; Champlain Sea; Eastern Canada; Paleoearthquake; Natural hazards
Funding
- Public Safety Geoscience Program, Earth Sciences Sector, Natural Resources Canada
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A landslide debris field covering similar to 31 km(2), the presence of large sediment blocks up to hundreds of meters long, and the exposure of deposits of a single landslide along the incised course of the Quyon River are evidence of a massive failure of sensitive Champlain Sea glaciomarine sediments along the lower Quyon Valley, southwestern Quebec, Canada. Seventeen radiocarbon ages indicate that the failure occurred between 980 and 1060 cal yr BP. Twenty-four additional radiocarbon ages reveal that nine landslides within a 65-km belt in the Quyon-Ottawa area also occurred at approximately this time. In combination, the contemporaneous occurrence of ten landslides between 980 and 1060 cal yr BP, the setting or morphology of five of the other failures, and the close proximity of two of the failures to the Quyon Valley landslide provide circumstantial evidence of a paleoearthquake-triggering mechanism. The paleoearthquake is estimated to be M-w similar to 6.1 or larger, with the epicenter within the West Quebec Seismic Zone. A common earthquake-triggering mechanism for the three largest landslides in eastern Canada suggests a close link between massive failures of sensitive glaciomarine sediments and the regional seismicity. Crown Copyright (C) 2013 Published by Elsevier Inc. on behalf of University of Washington. All rights reserved.
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