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TitleGround motions in Yukon from the Tatshenshini-Alsek Park earthquakes of 2017 compared to 2015 Canadian seismic design levels
AuthorKolaj, M
SourceGeological Survey of Canada, Open File 8293, 2018, 16 pages,
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
File formatpdf
ProvinceYukon; British Columbia
NTS104M/03; 104M/04; 104M/05; 104M/06; 104M/11; 104M/12; 104M/13; 104M/14; 105D/03; 105D/04; 105D/05; 105D/06; 105D/11; 105D/12; 105D/13; 105D/14; 114P; 115A
AreaHaines Junction; Whitehorse; Tatshenshini-Alsek Park
Lat/Long WENS-138.0000 -135.0000 61.0000 59.0000
Subjectsgeophysics; tectonics; seismology; earthquakes; building codes; seismographs; seismic risk; earthquake damage; earthquake magnitudes; earthquake risk; seismicity; bedrock geology; structural features; faults; strong motion seismology; models; National Building Code of Canada 2015; Canadian National Earthquake Database; Denali Fault; ground motions; geological hazards; spectral acceleration
Illustrationsgeoscientific sketch maps; location maps; spectra; graphs
Natural Resources Canada Library - Ottawa (Earth Sciences)
ProgramCanadian Hazard Information Service, Canadian Hazard Information Service
Released2018 02 06
AbstractThe two magnitude 6 earthquakes on May 1, 2017 were felt in the regions of Haines Junction and Whitehorse, YT and minor damage was reported. Five-percent damped spectral accelerations calculated from a seismograph situated near Haines Junction suggest that the first event had stronger ground motions than the second, even though the second had the larger magnitude. In Haines Junction, spectral accelerations reached approximately 1 % to 7.5 % of the 2015 seismic hazard design values (e.g. 3 % at 0.2 s). While the seismograph in Whitehorse was not operational at the time, the predicted motions from the event reached 5 % to 22 % of the design values (e.g. 12 % at 0.2 s for the first event). The higher percentages are largely due to the lower seismic hazard design values for Whitehorse. The results in this work are given for firm ground conditions (site class C), and varying local conditions could amplify or reduce these values.
Summary(Plain Language Summary, not published)
The two magnitude 6 earthquakes on May 1, 2017 were felt in the regions of Haines Junction and Whitehorse, YT and minor damage was reported. Recorded ground motions were compared to the 2015 seismic hazard design values as included in the 2015 National Building Code of Canada. The recorded and predicted motions from these two earthquakes were found to be well below the design values (1 % to 7.5 % for Haines Junction and 5 % to 22 % for Whitehorse).