charlevoix seismic zone

Nature (London). 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. The Western Quebec Zone was the site of at least three significant earthquakes in the past. Zebker, H.A., Studying the Earth with Interferometric Radar, Computing in Science and Engineering, vol. Most earthquakes cluster along or between the mapped Iapetan faults (also called St. Lawrence paleo-rift faults). More than 200 micro-earthquakes are recorded there every year and five damaging earthquakes in the magnitude (M) 6 range have occurred there (in 1663, 1791, 1860, 1870 and 1925). [6] On the shores of Massachusetts Bay, the tops of chimneys were broken on houses and pewter (a malleable metal alloy) was jarred from shelves. Multibeam bathymetry data and high resolution seismic reflection data acquired in the Saguenay Fjord has been used to identify a series of landslide deposits that were probably triggered by the 1663 earthquake. larger than magnitude 2.5) can be detected by the network and located by the analysts of the Geological Survey of Canada. At depth, CSZ earthquakes occur solely in the Precambrian basement from about 5 to 30 km depth, with two thirds between 7 and 15 km. In 1929 a large M7.2 earthquake occurred near the Grand Banks. Lamontagne, M., Keating, P. and Perreault, S., Seismotectonic characteristics of the Lower St. Lawrence Seismic Zone, Québec: Insights from geology, magnetics, gravity and seismics. The continual shifting of large segments of the earth's crust, called tectonic plates, causes more than 97% of the world's earthquakes. Although eastern Canada has relatively infrequent earthquakes, due to its location away from active plate boundaries, the CSZ is its most active part, with five earthquakes of estimated magnitude of 6 or greater since historical records began. The Laurentian Slope Seismic Zone comprises an area off Canada's southeast coast, which includes the Grand Banks of Newfoundland. [16], Magnitude 7 earthquake (February 5, 1663) affecting New France (now Quebec, Canada), "Historic Earthquakes: St. Lawrence Valley region, Quebec, Canada, 1663", "Submarine mass movements in the Upper Saguenay Fjord, (Québec, CAnada), triggered by the 1663 earthquake", "A New Analysis of the Magnitude of the February 1663 Earthquake at Charlevoix, Quebec", "Le Ciel et la Terre nous ont parlé — Comment les missionnaires du Canada français de l'époque coloniale interprétèrent le tremblement de terre de 1663",, Creative Commons Attribution-ShareAlike License, This page was last edited on 19 October 2020, at 15:08. From focal mechanisms of CSZ earthquakes, it is known that most earthquakes represent strike-slip to reverse faulting on fault planes with varied orientations (Lamontagne, 1999). The seismicity and seismotectonics of Canada East of the Cordillera, Geoscience Canada, 16, 3-16. In such a large earthquake, Earth Observation information can be helpful to manage the emergency situations. The CSEG does not endorse or warrant the information printed. 6); 1870 (Mag. These systems provide images sufficiently detailed to locate collapsed buildings (Chiroiu and André, 2002; Adams et al., 2003). Gray, 2000. [3] Lalemant was said to have been a disciplined priest with diverse experience and following his time in Canada was brought back to France to be posted the provincial superior of the Society of Jesus. The method takes into account and corrects for all the distortions related to the full geometry of viewing (e.g., viewing angle of the sensor, position and velocity of the satellite, and curvature, rotation and elevation of the earth) and the map projection. The topography of the north shore is a mixture of rugged highlands, plateaus and valleys separated by dramatic changes in elevation. Unlike plate boundary regions where the rate and size of seismic activity is directly correlated with plate interaction, eastern Canada is part of the stable interior of the North American Plate. It is cut by faults created during at least four major tectonic events: the Grenvillian collision (1100 to 900 Ma); the rifting episode related to the opening of the Iapetus Ocean (700 Ma); the Taconian reactivation of these faults at the closing of that ocean (450 Ma); and finally, a Devonian meteor impact (350 Ma; Rondot, 1979). The region is closely monitored by a network of five local stations of the Canadian National Seismograph Network. About 60 events are recorded in the LSZ annually. 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. Chromo-stereoscopy is a method which enables the display and the perception of depth from multiple sources, such as remote sensing and geoscientific data (Toutin, 1997; Toutin and Rivard, 1997). While the CSEG strives to ensure the content published is correct, the CSEG cannot guarantee its accuracy. The CSZ was also active prehistorically, as indicated by lake disturbances and landslides. Copyright © Canadian Society of Exploration Geophysicists. Adams, J., Weichert, D.H., Halchuk, S., and Basham, P.W., “Trial seismic hazard maps of Canada – 1995: Final values for selected Canadian cities”. In Charlevoix, composite products that include remote sensing imagery reveal a very complex fault distribution (Figure 2). This information is important for relief agencies (rescue teams) that need to quickly locate potential victims and map structures at risk. For the elevation, the colour range varies from 0 m in blue to 1100 m in red. The Northern Appalachians Seismic Zone includes most of New Brunswick and extends into New England down to Boston. Radar sensors have the advantage of operating in all-weather and night conditions. In these clusters, earthquakes occur at depths varying from surface to 30 km (the deepest mine in Canada is 2 km deep). One drawback of these systems is that they are far from being near-real-time services and they depend on cloud-free conditions. Most CSZ earthquakes have hypocenters within the Grenvillian basement at depths between 7 and 15 km. In 1929 a large M7.2 earthquake occurred near the Grand Banks and was responsible for a large tsunami (seismic sea-wave) which tragically drowned 27 people when it came ashore on the Burin Peninsula in southern Newfoundland. Minor mag. One of these areas is the Charlevoix Seismic Zone (CSZ) of Quebec, one of the most seismically active regions of Canada (Figure 1). Adams, J., and P.W. Vlahovic, G., Powell, C.A., Lamontagne, M., Three-dimensional P-Wave Velocity Model for the Charlevoix Seismic Zone. Linking these faults with the earthquake activity is difficult because the earthquakes are deep and little control exists on the fault orientations at depth. Larger events lie outside the impact structure and have inferred nodal planes consistent with reactivation of the rift faults. Image pro ducts that include remote sensing imagery have helped defining some characteristics of these faults. [7] Using this MMI value and the distance from the epicenter one can estimate the magnitude of the earthquake using published intensity-attenuation relations. One of these areas is the Charlevoix Seismic Zone (CSZ) of Quebec, one of the most seismically active regions of Canada (Figure 1). The Charlevoix Seismic Zone (CSZ) lies along the St. Lawrence River, northeast of Quebec City. Had these rates existed over millions of years, evidence of this activity would have been mapped in the field and seen in the seismic reflection profiles. A simultaneous hypocentre-velocity inversion has revealed that hypocentres occur in rocks that surround the lowest velocity regions and tend to avoid those with high velocity (Vlahovic et al., 2004). The causes of earthquakes in eastern Canada are not well understood. In 1996 and 1997, two earthquakes of magnitude 4.4 and 4.3 occurred near Ste-Agathe-des-Monts, Quebec. Value added Radarsat products for geoscientific applications, Can. The three large regional faults, the St-Laurent, South Shore and Charlevoix faults, seem to bound active volumes rather than being active themselves (Figure 3). 2, pp. 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. 2000). Two magnitude 5 earthquakes (1905, northern Michigan, and 1928, northwest of Kapuskasing) have occurred in this region. [5] This level of damage is consistent with a modified Mercalli intensity of VI though this may have been because the early colonials had the capability of producing only relatively weak mortar. 7); 1791 (Mag. He participated in various field programs, analyzing the recorded data and correlating the results with geological faults. These methods offer ways to map damage and earthquake impacts. In the CSZ, the Precambrian basement outcrops only on the north shore of the St. Lawrence River. Journal of Geophysical Research (in press). Most of the larger events (star symbol in Figure 2) tend to concentrate at either end of the CSZ.

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