|Title||Strong motion monitoring and datasets in Canada and some challenges for regions that experience large earthquakes (but lack recordings of large earthquakes)|
|Author||Cassidy, J; Onur,
T; Rogers, G; Herrera, C|
|Source||Book of abstracts, 36th General Assembly of the European Seismological Commission; by D'Amico, S (ed.); Galea, P (ed.); Bozionelos, G (ed.); Colica, E (ed.); Farrugia, D (ed.); Agius, M R (ed.); 2018 p.
549 Open Access|
|Links||Online - En ligne (complete volume - volume
complet, PDF, 9.91 MB)|
|Alt Series||Natural Resources Canada, Contribution Series 20180078|
|Publisher||European Seismological Commission|
|Meeting||European Seismological Commission 36th General Assembly; Valletta; MT; September 2-7, 2018|
|File format||pdf (Adobe® Reader®)|
|Province||Canada; British Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut;
|NTS||1; 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|
|Subjects||geophysics; Science and Technology; seismology; strong motion seismology; earthquakes; earthquake risk; earthquake magnitudes; seismicity; seismic risk; seismological network; in-field instrumentation;
building codes; Canadian National Seismograph Network; monitoring|
|Program||Public Safety Geoscience Assessing Earthquake Geohazards|
|Released||2018 09 01|
|Abstract||In this presentation, we outline the history of Canada's strong ground monitoring program (including current upgrades that are underway), summarise the existing Canadian strong motion data set, and
discuss some of the challenges in regions that experience large, infrequent earthquakes and therefore lack 'strong motion' recordings.|
Canada spans a variety of tectonic and geological settings, including an active plate boundary (with active
subduction as well as divergent and transcurrent plate motions), a stable craton with the oldest rocks on earth, and an ancient passive margin. As the second largest country in the world, and with such a variety of tectonic settings, understanding
strong ground motions from rare, large earthquakes is a challenging endeavour.
The first strong motion instruments were deployed in Canada in 1963. The goal of this monitoring program was (as it is today) to obtain strong ground motion recordings
on a variety of environments (bedrock, soft soil, firm soil, basins, etc.) By 1968, 14 accelerographs (and 48 seismoscopes) were deployed in the seismically active regions of coastal British Columbia. Over the years this network expanded across
Canada, by 1999 including more than 70 instruments. Starting in 2002 a modern, digital 'internet accelerometer' network with more than 100 instruments was deployed to take advantage of low-cost instrumentation, on-site computation, and internet
communications. Beginning in 2017, as a part of the modernisation of the Canadian National Seismograph Network (CNSN), more than 100 broadband seismic sites will have Nanometrics 'Titan' accelerometers added. These standard CNSN sites are all
situated on bedrock.
Ongoing questions and discussions include the adaptation and validation of GMPEs developed with data from elsewhere around the world, site effects, basin effects, non-linear effects, and more. In the current National Building
Code, subduction earthquake GMPE's are dominated by recordings of the Tohoku earthquake, with corrections made for geological differences between Japan and Canada's west coast. Many of these topics are also relevant for seismic hazard evaluations in
Europe and elsewhere in the world.
|Summary||(Plain Language Summary, not published)|
This invited presentation outlines the importance of strong ground motion recordings of large earthquakes. We outline the history of Canada's strong
ground monitoring program (including current upgrades that are underway), summarise the existing Canadian strong motion data set, and discuss some of the challenges in regions that experience large, infrequent earthquakes and lack 'strong motion'