From 1970 to 1999, on average only 1 or 2 magnitude 2.5 or greater earthquakes have been recorded in this large area. They were pleased to see all the colonists attending church regularly in the following days and that even the traffickers in wine and brandy appeared to repent. The seismic provisions of the National Building Code of Canada are partly based on knowledge of historical earthquakes and the geological factors that favour their occurrence. The epicentres define a 30 by 85 km ellipse with the major axis parallel to the St. Lawrence River (Figure 2). The complexity of CSZ seismicity can be explained by a combination of factors. firstname.lastname@example.org. For the St. Lawrence valley, the seismic provisions of the upcoming NBCC in 2005 are influenced by the interpretation that a link may exist between CSZ earthquakes and paleo-rift faults. Lamontagne, M., Keating, P. and Perreault, S., Seismotectonic characteristics of the Lower St. Lawrence Seismic Zone, Québec: Insights from geology, magnetics, gravity and seismics. Located some 100 km downstream from Quebec City, the Charlevoix Seismic Zone (CSZ) is the most seismically active region of eastern Canada. As most earthquakes occur under the St. Lawrence River, between the regions of the Quebec North Shore and the Lower St. Lawrence, this zone is sometimes refered to as the "Lower-St. Lawrence-Quebec North Shore" Seismic Zone. More information is available on the historical seismicity of the following regions in Eastern Canada: Northern Ontario has a very low level of seismic activity. What is the Charlevoix Seismic Zone? http://www.riskworld.com/Nreports/2001/Bhuj,India,earthquake2001.pdf, Earthquake Hazard Team Report, CEOS Disaster Management Support Group, 2001. http://disaster.ceos.org/2001Ceos/Reports/earthquake.html. The current CSZ network detects more than 200 earthquakes per year. In the CSZ, the Precambrian basement outcrops only on the north shore of the St. Lawrence River. Earthquakes are not distributed uniformly across the seismic zone but are concentrated in groups separated by less active areas. The absence of any apparent CSZ surface rupture suggests that the current rates of seismic strain release are geologically recent. We can imagine CSZ fault zones to be irregular surfaces surrounded by highly fractured rocks. Linking these faults with the earthquake activity is difficult because the earthquakes are deep and little control exists on the fault orientations at depth. , Great landslides along the Saint Lawrence, Saint-Maurice, and Batiscan Rivers made these rivers muddy after the shock, with the waters of the St. Lawrence being affected for up to one month. Some rights reserved. InSAR can also contribute to the mitigation phase by adding to the spatial understanding of fault mechanism dynamics and strain, an aspect that could be used in seismically active areas such as the CSZ. The event occurred during the early European settlement of North America and some of the best recorded first hand accounts were from Catholic missionaries that were working in the area. More recently, on March 16, 1999, an earthquake of magnitude 5.1 occurred in this region, at about 60 km south of Sept-Iles. Overall, the distribution of historical and recent events shows an earthquake concentration between La Malbaie and Rivière-du-Loup. They described it as "miraculous" rather than a disaster, regarding the date of the earthquake as particularly important, coming on the last day of the carnival, just before Mardi Gras. Father Simon seemed to not be of the same mind as the bulk of the devoted, saying "...the Earthquake was rather a Scheme of Divine Mercy than a scourge of Justice,— especially since, in so great a confusion of affairs and perturbations of the elements, no one lost life or fortune. 7); 1791 (Mag. Two magnitude 5 earthquakes (1905, northern Michigan, and 1928, northwest of Kapuskasing) have occurred in this region. To study the faults better, a chromo-stereoscopic image (about 80 km by 90 km; 30-m pixel size) integrates a RADARSAT orthoimage with terrain elevation and seismicity, each data set with its own colour range. In 1996 it was the site of the largest flood in 20th-century Canadian history, which led to the investigation of the fjord bottom using bathymetric data to determine slope stability. As most earthquakes occur under the St. Lawrence River, between Charlevoix County on the north shore and Kamouraska County on the south shore, this region is also often referred to as the Charlevoix-Kamouraska Seismic Zone. Geological Survey of Canada Open File 3283, 1996. In these clusters, earthquakes occur at depths varying from surface to 30 km (the deepest mine in Canada is 2 km deep). In 1996 and 1997, two earthquakes of magnitude 4.4 and 4.3 occurred near Ste-Agathe-des-Monts, Quebec. Lamontagne, M., Rheological and Geological Constraints on the Earthquake Distribution in the Charlevoix Seismic Zone, Ph.D. Thesis, Carleton University, ( Available on CD-ROM, Geological Survey of Canada Open File Report D-3778); 1999.  Using this MMI value and the distance from the epicenter one can estimate the magnitude of the earthquake using published intensity-attenuation relations. Adams, B. J., Huyck, C. K., Mansouri, B., Eguchi, R. T., and Shinozuka, M., Application of High-Resolution Optical Satellite Imagery for Post-Earthquake Damage Assessment: The 2003 Boumerdes (Algeria) and Bam (Iran) Earthquakes. Value added Radarsat products for geoscientific applications, Can.
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