The 1791 magnitude (Mw) 5.5 earthquake, Charlevoix, Quebec : interpretation of macroseismic information / M. Lamontagne. : M183-2/8739E-PDF

"The December 6, 1791 magnitude 6 Charlevoix earthquake occurred at approximately 8:00 p.m. local time (December 7, 1791, 01:00 U.T.). Based on felt reports, the epicentre of the main shock is located near the St. Lawrence River in the area enclosing on the North Shore, Baie St-Paul and the Île-aux-Coudres and on the south shore, the town of Kamouraska. These three places sustained the most damage from the earthquake, mostly to house wares and masonry chimneys. The churches of Bas-des-Éboulements (now St-Joseph-dela- Rive) and Kamouraska were damaged. In the following weeks, dozens of aftershocks continued to shake the epicentral area, keeping local residents on high alert. The 1791 earthquake is one of five known moment magnitude 5.5 to 7 events that have occurred in the Charlevoix Seismic Zone (CSZ) between 1663 and the present. Given that this earthquake occurred in the late 1700's and far from major cities, felt accounts and newspaper reports are limited in number. It was felt in Quebec City but not reported felt in Montreal, New England or New Brunswick. This Open File Report presents the macroseismic information and its ratings on the Modified Mercalli Scale for a total of nine locations in Canada. For each locality, the felt information is rated on the Modified Mercalli intensity (MMI) scale and tabulated in a Microsoft Excel sheet. The text of some of the newspaper accounts were copied. The Open File also provides a GoogleEarth kmz file that allows the felt information reports to be viewed in a spatial tool"--Abstract, page 1.

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