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TitleCanadian strong motion monitoring and recent datasets from Natural Resources Canada
AuthorCassidy, J FORCID logo; Adams, JORCID logo; Rogers, G C; Halchuk, S
SourceProceedings of the 11th Canadian Conference on Earthquake Engineering; 2015 p. 1-9
Alt SeriesEarth Sciences Sector, Contribution Series 20150059
PublisherCanadian Association of Earthquake Engineers
Meeting11th Canadian Conference on Earthquake Engineering; Victoria; CA; July 21-24, 2015
File formatpdf
ProvinceBritish Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut; Canada
NTS1; 2; 3; 10; 11; 12; 13; 14; 15; 16; 20; 21; 22; 23; 24; 25; 26; 27; 28; 29; 30; 31; 32; 33; 34; 35; 36; 37; 38; 39; 40; 41; 42; 43; 44; 45; 46; 47; 48; 49; 52; 53; 54; 55; 56; 57; 58; 59; 62; 63; 64; 65; 66; 67; 68; 69; 72; 73; 74; 75; 76; 77; 78; 79; 82; 83; 84; 85; 86; 87; 88; 89; 92; 93; 94; 95; 96; 97; 98; 99; 102; 103; 104; 105; 106; 107; 114O; 114P; 115; 116; 117; 120; 340; 560
AreaVancouver; Vancouver Island; Haida Gwaii; Ottawa; Charlevoix
Lat/Long WENS-141.0000 -50.0000 90.0000 41.7500
Subjectsgeophysics; seismology; seismological network; strong motion seismology; earthquake studies; earthquake mechanisms; earthquake catalogues
Illustrationslocation maps; tables
ProgramPublic Safety Geoscience Western Canada Geohazards Project
Released2015 01 01
AbstractStrong motion monitoring continues to evolve rapidly in Canada, with many organisations continuing to contribute data. This article summarises the current state of strong motion monitoring across Canada, and recent (since 2008) strong motion datasets. As of January, 2015, the Geological Survey of Canada (GSC) - a part of Natural Resources Canada (NRCan), operates 132 strong motion instruments (Internet Acclerometers or IA's) across Canada, primarily deployed in the urban centres of high seismic hazard in southwest British Columbia. BC Hydro operates more than 60 strong motion instruments at dam sites and substations across BC. The BC Ministry of Transportation and Infrastructure now operates ~100 instruments (including more than 50 free-field and five downhole arrays) at or near sites of critical transportation infrastructure. Ocean Networks Canada currently has three strong motion instruments on the seafloor west of Vancouver Island, and five along the west coast of Vancouver Island, and UBC and BCSIMS have deployed 28 instruments, primarily at schools in southwest BC. In eastern Canada, NRCan operates 18 strong motion instruments (ETNA¿s) in the active Charlevoix zone, four IA¿s in Ottawa and four IA¿s in Montreal. Other organisations that operate strong motion instruments in eastern Canada include: Hydro-Quebec at 12 dams and substations; Ontario Power Generation and New Brunswick at their nuclear power stations; PWGSC at Parliament Hill; and Gaz Metropolitain at its Montreal LNG plant. Since 2010, more than 150 accelerograms have been recorded across Canada, sampling a variety of settings from intraplate (Mw 5.0 2010 Val du Bois, Quebec) to active tectonic regions off the west coast of Vancouver Island (Mw 6.6), and offshore Haida Gwaii (2012 Mw 7.8). While some large earthquakes have been recorded, the strongest ground motions are less than 20%g. Nevertheless, these datasets are still useful for comparison with proposed attenuation relations, and for evaluating local earthquake site response. The results of these studies are valuable to engineers evaluating strong ground shaking during future earthquakes.
Summary(Plain Language Summary, not published)
The strong motion earthquake monitoring system in Canada (operated by NRCan and at least 8 other organisations) has expanded to more than 320 instruments. During strong nearby earthquakes these are the only instruments that will remain on-scale and provide the accurate ground shaking recordings required by engineers and first responders. With real-time communications these instruments also provide new opportunities for the development of earthquake and tsunami early warning systems. During the past 7 years, NRCan strong motion instruments have provided nearly 1000 records of earthquake shaking. The goal of this article is to highlight this monitoring network and share this valuable dataset.

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