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TitleForensic PSHA: benchmarking Canada's Fifth Generation seismic hazard model using the OpenQuake-engine
AuthorAllen, T I; Halchuk, S; Adams, JORCID logo; Weatherill, G A
SourceGEM's 2018 global hazard and risk model; by Pagani, M (ed.); Silva, V (ed.); Jaiswal, K (ed.); Allen, T (ed.); Earthquake Spectra vol. 36, issue 1_suppl, 2020 p. 1-21,
Alt SeriesNatural Resources Canada, Contribution Series 20200417
Mediaon-line; digital
File formatpdf; html
ProvinceCanada; British 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
Subjectsgeophysics; Science and Technology; Health and Safety; Nature and Environment; seismology; earthquakes; earthquake risk; seismicity; seismic risk; models; software; bedrock geology; structural features; tectonic setting; faults; Fifth Generation Seismic Hazard Model of Canada; National Building Code of Canada (NBCC); GSCFRISK; OpenQuake-engine; Emergency preparedness; Emergency services
Illustrationsplots; schematic models; location maps; geoscientific sketch maps; tables
ProgramCanadian Hazard Information Service
Released2020 02 25
AbstractThis article explores the implementation of the Natural Resources Canada's Fifth Generation national seismic hazard model as developed for the National Building Code of Canada (NBCC), within the OpenQuake-engine. It also describes the reconciliation of the differences in hazard estimates relative to the published NBCC values, calculated using GSCFRISK. Source and ground-motion input models developed for the GSCFRISK software were translated to the OpenQuake-engine format for the hazard comparison. In order to successfully undertake this process, several adjustments to the OpenQuake code were needed to mimic the behavior of GSCFRISK. This required the development of new functions for earthquake-rupture scaling and ground-motion interpolation. Hazard values estimated using the OpenQuake-engine are generally in good agreement with the 2015 NBCC national-scale hazard values, with differences less than 2%-3% typically achieved. Where larger differences arise, they can be rationalized in terms of differences between the behaviors of the two software engines with respect to earthquake-rupture length uncertainty and maximum ground-motion integration distance.
Summary(Plain Language Summary, not published)
Canada's seismic hazard modelling program (GSCFRISK) is nearly 30 years old and needs to be replaced. The OpenQuake hazard program is able to handle the advancements in our understanding of hazard and will be used to provide values for the 2020 National Building Code of Canada. We want to ensure that the two programs generate similar hazard values given similar model inputs. This will help to demonstrate that future differences in hazard are due to scientific advances in the model rather than differences in the software packages. By careful examination of the model inputs we were able to minimize the differences in hazard values between the two programs to 2-3%. This was determined to be an acceptable level of similarity between the two software packages.

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