January 26, 1700 – estimated M9.
New York. Largest known earthquake north of the Arctic Circle: 1929-11-18: Grand Banks of … 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.Historically, the zone has been subject to five earthquakes of magnitude 6 or larger: in The earthquake potential of the CSZ led the GSC to conduct two field surveys in 1970 and 1974. The hypocentres located over the years have provided an insight into the CSZ seismotectonics.Most earthquakes cluster along or between the mapped Iapetan faults (also called St. Lawrence paleo-rift faults).
Two magnitude 5 earthquakes (1905, northern Michigan, and 1928, northwest of Kapuskasing) have occurred in this region.This region has a low to moderate level of seismicity when compared to the more active seismic zones to the east, along the Ottawa River and in Quebec. The continual shifting of large segments of the earth's crust, called tectonic plates, causes more than 97% of the world's earthquakes. From some focal mechanism determinations (see references below) and by analogy with the CSZ, most earthquakes probably cluster along or between the mapped Iapetan faults (also called St. Lawrence paleo-rift faults), beneath the Logan's line and the Appalachians.A Lower St. Lawrence earthquake occurs every five days on average.The Northern Appalachians Seismic Zone includes most of New Brunswick and extends into New England down to Boston.The Laurentian Slope Seismic Zone comprises an area off Canada's southeast coast, which includes the Grand Banks of Newfoundland.
Southern Ontario, Canada. The Queen Charlotte Fault was the site of three of the largest earthquakes in Canada’s history, including the largest one in 150 years.
This map, originally published in the June 2015 issue of British Columbia is widely known to be Canada's seismic danger zone, but every so often the shifting Earth reminds us that the rest of the country isn't immune to the sometimes fickle movements of tectonic plates. Nevertheless, large and damaging earthquakes have occurred here in the past and will inevitably occur in the future.Each year, approximately 450 earthquakes occur in eastern Canada.
Ontario. These two surveys clearly delineated the CSZ to be an active zone about 30 by 85 km, elongated along the St. Lawrence River, and enclosing the towns of Baie-St-Paul, La Malbaie and La Pocatière.Due to its dense seismograph network, the CSZ is the only eastern Canadian region where the focal depth of earthquakes can be routinely calculated. Ottawa, Ontario, Canada. The Royal Canadian Geographical Society family of sites:A recent earthquake in Nunavut has drawn attention to Canada's surprising seismic zones 3.1 magnitude earthquake 1981-09-05 05:49:20 UTC at 05:49 September 05, 1981 UTC Location: Epicenter at 42.73, -81.35 14.2 km from St. Thomas (9.2 miles) In 1990, an earthquake of magnitude 5 took place near Mont-Laurier, Quebec.
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. View seismicity during the last 30 days. Of this number, perhaps four will exceed magnitude 4, thirty will exceed magnitude 3, and about twenty-five events will be reported felt. By comparison, over the same time period, the smaller region of Western Quebec experienced 15 magnitude 2.5 or greater earthquakes per year.Three moderate sized (magnitude 5) events have occurred in the 250 years of European settlement of this region, all of them in the United States - 1929, The Western Quebec Seismic Zone constitutes a vast territory that encloses the Ottawa Valley from Montreal to Temiscaming, as well as the Laurentians and the Eastern Ontario. 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.Unlike the Charlevoix Seismic Zone, no large earthquake has ever been reported or recorded in the LSZ. Montréal, Quebec, Canada. Most earthquakes occur under the St. Lawrence River, within a triangular zone defined by the towns of Baie-Comeau, Sept-Iles, and Matane on the south shore.Although the network is not sufficiently dense to accurately determine earthquake focal depths, it can be assumed that the active zone lies in the mid- to upper crust, between 5 and 25 km depth, similar to the Charlevoix Seismic Zone (CSZ).
Seismic activity in areas like these seems to be related to the regional stress fields, with the earthquakes concentrated in regions of crustal weakness.Although earthquakes can and do occur throughout most of eastern Canada, years of instrumental recordings have identified certain clusters of earthquake activity. The seismograph network of Earthquakes Canada can detect all events exceeding magnitude 3 in eastern Canada and all events magnitude 2.5 or greater in densely populated areas.The causes of earthquakes in eastern Canada are not well understood. Measuring 7.3 on the Richter scale, it remains the largest known earthquake north of the Arctic Circle.
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