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TitleApplications of moment tensor solutions to the assessment of earthquake hazard in Canada
 
AuthorCassidy, J FORCID logo; Kao, HORCID logo; Ristau, J; Bent, A
SourceMoment tensor solutions: a useful tool for seismotectonics; by D'Amico, S (ed.); Springer Natural Hazards 2018 p. 307-317, https://doi.org/10.1007/978-3-319-77359-9 14
Image
Year2018
Alt SeriesNatural Resources Canada, Contribution Series 20170017
PublisherSpringer International Publishing
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf (Adobe® Reader®)
ProvinceCanada; British Columbia; Alberta; Saskatchewan; Manitoba; Ontario; Quebec; New Brunswick; Nova Scotia; Prince Edward Island; Newfoundland and Labrador; Northwest Territories; Yukon; Nunavut
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
Lat/Long WENS-141.0000 -50.0000 90.0000 41.7500
Subjectsgeophysics; tectonics; Science and Technology; Nature and Environment; seismology; earthquakes; earthquake risk; seismicity; seismic risk; earthquake catalogues; earthquake magnitudes; modelling; tectonic environments; tectonic setting; subduction zones; bedrock geology; structural features; faults; craton; crustal studies; crustal movements; deformation; stress analyses; tsunami; Cascadia Subduction Zone; Queen Charlotte Fault; Canadian Cordillera; Appalachian Province; Canadian Shield; Grenville Province; Appalachian Orogeny; Haida Gwaii Thrust Fault; geological hazards; methodology; moment tensor solutions; seismotectonics
Illustrationsgeoscientific sketch maps; block diagrams; focal mechanisms; plots; seismograms
ProgramPublic Safety Geoscience, Assessing Earthquake Geohazards
Released2018 05 13
Abstract(unpublished)
Centroid moment tensor solutions have played an important role in understanding the seismotectonics of the Canadian landmass, and have been directly utilised in the development of national earthquake hazard models. Since 1995, more than 1000 earthquake moment tensor solutions have been computed across Canada. A 'regional' centroid moment tensor approach has been used, allowing for solutions of smaller earthquakes (e.g., down to about magnitude 3.5) compared to global moment tensor techniques. These solutions, covering all tectonic regions of Canada, have provided information on faulting style, focal depth, and moment magnitude (Mw). Some specific examples of the applications of moment tensor analysis to improved earthquake hazard assessments in Canada includes: developing a uniform Mw catalogue for Canada; mapping the crustal stress field - thereby allowing for improved delineation of earthquake source zones in hazard models; identification of a new active subduction fault (the Haida Gwaii Thrust Fault) to the west of Moresby Island; and an improved understanding of associated tsunami hazards. Moment tensor solutions also contribute to the important and rapidly evolving field of understanding induced seismicity in Canada and around the world. As the moment tensor catalogue continues to grow, and is expanded to earthquakes of lower magnitude, applications to improve our assessments of earthquake hazards will also expand dramatically.
Summary(Plain Language Summary, not published)
This book chapter describes how earthquake "moment tensor solutions" (that describe the size and depth of an earthquake as well as the type of movement along the fault) have been used in Canada to better understand tectonics and earthquake hazard. More than 1000 moment tensor solutions (since 1995) have been used to map crustal stresses, active tectonics, earthquake depth and characteristics. These results have been incorporated in the 2015 National Building Code of Canada.
GEOSCAN ID300535

 
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