| Title | Ground motions in Yukon from the Tatshenshini-Alsek Park earthquakes of 2017 compared to 2015 Canadian seismic design levels |
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| Licence | Please note the adoption of the Open Government Licence - Canada
supersedes any previous licences. |
| Author | Kolaj, M |
| Source | Geological Survey of Canada, Open File 8293, 2018, 16 pages, https://doi.org/10.4095/306502  Open Access |
| Image |  |
| Year | 2018 |
| Publisher | Natural Resources Canada |
| Document | open file |
| Lang. | English |
| Media | on-line; digital |
| File format | pdf |
| Province | Yukon; British Columbia |
| NTS | 104M/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 |
| Area | Haines Junction; Whitehorse; Tatshenshini-Alsek Park |
| Lat/Long WENS | -138.0000 -135.0000 61.0000 59.0000 |
| Subjects | geophysics; 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 |
| Illustrations | geoscientific sketch maps; location maps; spectra; graphs |
| Program | Canadian Hazard Information Service |
| Released | 2018 02 06 |
| Abstract | 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. 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). |
| GEOSCAN ID | 306502 |
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