CGRG Bibliography of Canadian Geomorphology
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Author : Daurio, L .; Doughty, M.; and Eyles, N.
Date : 2009.
Title : Earthquake (1935 Timiskaming M6.2) triggered slumps in Lake Kipawa, Western Quebec Seismic Zone, Canada.
Publication : Eos Transactions AGU. 2009 Joint Assembly. The Meeting of the Americas. May 24-27, 2009. Toronto, Ontario, Canada.
Issue : 90(22), Joint Assembly Supplement.
Page(s) : Abstract T31A-01.
Abstract
The Western Quebec Seismic Zone (WQSZ) includes the urban areas of Montreal and Canada's national capital Ottawa. It is characterised by frequent large magnitude intracratonic earthquakes (e.g., 1732, M5.8; 1935, M6.2 and 1944, M5.2) centred along the Timiskaming and Ottawa-Bonnechere grabens but seismic risk analysis is challenged by short instrumental records and long recurrence intervals. The M6.2 1935 Timiskaming Earthquake is the largest recorded to date and was felt over some 1.3 million km2 of eastern North America with many aftershocks of magnitude 4 to 5. Its epicentre lies below the western margin of Lake Kipawa in the area where a major crustal boundary (the Grenville Front Tectonic Zone) crosses the Timiskaming Graben. A high-resolution 'chirp' reflection survey of the late glacial and postglacial sediment infill of Lake Kipawa reveals a clear record of earthquake-related ground shaking. Widespread slumps record the down slope failure of the entire late glacial and postglacial stratigraphy indicating that the 1935 temblor was the largest in this area. Systematic mapping of landslides identifies they extend across an area of 600 km2 around the 1935 epicentre. Lakes cover a large area of eastern Canada; a regional-scale survey of lake floors could constrain historic epicentres and postglacial seismic history of the heavily populated WQSZ.
Bibliography of Canadian Geomorphology