mx in canada’s 4 th generation seismic hazard model
DESCRIPTION
Figure A11–1. Mx in Canada’s 4 th Generation seismic hazard model. John Adams Presentation for USGS Mmax meeting Golden 2008 09 09. Developed ~1994-1997 Finalized 2003 Implemented in 2005 code. 4th Generation model. Documentation - PowerPoint PPT PresentationTRANSCRIPT
![Page 1: Mx in Canada’s 4 th Generation seismic hazard model](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814931550346895db673a0/html5/thumbnails/1.jpg)
Mx in Canada’s 4th Generation seismic hazard model
Documentation
http://earthquakescanada.nrcan.gc.ca/hazard/OF4459/index_e.php
Developed ~1994-1997
Finalized 2003
Implemented in 2005 code
John AdamsPresentation for USGS Mmax meeting Golden 2008 09 09
4th Generation model
Figure A11–1
![Page 2: Mx in Canada’s 4 th Generation seismic hazard model](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814931550346895db673a0/html5/thumbnails/2.jpg)
Magnitude-recurrence for eastern
Canada
1929 Grand Banks
1933 Baffin
Bay
7.37.5 8.0
Figure A11–2
![Page 3: Mx in Canada’s 4 th Generation seismic hazard model](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814931550346895db673a0/html5/thumbnails/3.jpg)
Stable Craton Core (SCC) rates and Mmax Fenton and Adams, 1997; Fenton et al 2006
One M6.5 per decade Places like Canadian
Shield!
http://earthquakescanada.nrcan.gc.ca/hazard/2006/2006FentonAdamsHalchukGEGE.pdf
Figure A11–3
![Page 4: Mx in Canada’s 4 th Generation seismic hazard model](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814931550346895db673a0/html5/thumbnails/4.jpg)
Floor Hazard estimates - Three rates to capture uncertainty:
B) Observed North American shield activity rate Wt = 0.4
A) Global earthquake activity of continental shields Wt = 0.4
C) Rate for central Canada not in a source zone Wt = 0.2
Then, seismic hazard computed for centre of large zone
Figure A11–4
![Page 5: Mx in Canada’s 4 th Generation seismic hazard model](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814931550346895db673a0/html5/thumbnails/5.jpg)
Uniform Hazard Spectrasoil class C
Floor UHS for 2%/50yr
Figure A11–5
![Page 6: Mx in Canada’s 4 th Generation seismic hazard model](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814931550346895db673a0/html5/thumbnails/6.jpg)
This is a 1999 deaggregation using EZ-Frisk. Details may have changed, but pattern will be the same.
Figure A11–6
![Page 7: Mx in Canada’s 4 th Generation seismic hazard model](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814931550346895db673a0/html5/thumbnails/7.jpg)
Floor value
Figure A11–7
![Page 8: Mx in Canada’s 4 th Generation seismic hazard model](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814931550346895db673a0/html5/thumbnails/8.jpg)
Mesozoic rifted margin
Mobs ~7.4Weighted branches best, upper, lower
7.5 8.0 7.30.68 0.16 0.16
Plenty of potential large faults -> M8
Figure A11–8
![Page 9: Mx in Canada’s 4 th Generation seismic hazard model](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814931550346895db673a0/html5/thumbnails/9.jpg)
Paleozoic rifted margin
Mobs ~7.0Weighted branches best, upper, lower
7.5 7.7 7.20.68 0.16 0.16
Enough potential large faults
Figure A11–9
![Page 10: Mx in Canada’s 4 th Generation seismic hazard model](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814931550346895db673a0/html5/thumbnails/10.jpg)
Interior ?slightly extended
Mobs ~5.0Weighted branches best, upper, lower
7.0 7.2 6.80.68 0.16 0.16
potential large faults?
insensitive to Mmax
consistent with SCC
Figure A11–10
![Page 11: Mx in Canada’s 4 th Generation seismic hazard model](https://reader035.vdocuments.site/reader035/viewer/2022070502/56814931550346895db673a0/html5/thumbnails/11.jpg)
Paleozoic rifted margin
Mobs ~5.0Weighted branches best, upper, lower
7.5 7.7 6.00.68 0.16 0.16
potential large faults?
insensitive to Mmax
inconsistent with SCC!
Figure A11–11