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GPS Constraints on Seismic Hazard in Continental Intraplate Regions: Eastern Canada Example

Figure A10–1. GPS Constraints on Seismic Hazard in Continental Intraplate Regions: Eastern Canada Example S. Mazzotti, J. Henton, T. James, J. Adams Geological Survey of Canada & Geodetic Survey Division, Natural Resources Canada

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GPS Constraints on Seismic Hazard in Continental Intraplate Regions: Eastern Canada Example

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  1. Figure A10–1 GPS Constraints on Seismic Hazard in Continental Intraplate Regions: Eastern Canada Example S. Mazzotti, J. Henton, T. James, J. Adams Geological Survey of Canada & Geodetic Survey Division, Natural Resources Canada JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 110, B11301, doi:10.1029/2004JB003590, 2005

  2. (2) Crustal Strain from GPS Figure A10–2 Regional strain = E-W shortening (agrees with earthquake mechanisms) Strain rates 1-4 x 10-9 /yr <=> Convergence across St Lawrence 0-1 mm/yr

  3. Figure A10–3 (3) GPS & Seismic Hazard Assumptions for integration of GPS strain rates in hazard: 1) Strain model: GPS a Seismic strain release 2) Earthquake statistics: GR recurrence / characteristic 3) Seismic thickness: maximum depth / effective thickness Magnitude & Recurrence of large earthquakes

  4. (3) GPS & Seismic Hazard Figure A10–4 GPS convergence rate: ~0.7 +/- 0.4 mm/yr Gutenberg-Richter distribution up to Mx Charlevoix: Mx = 7.8 (std. 7.2-8.5) Lower St Lawrence: Mx = 7.3 (std. 5.5-8.3)

  5. (3) GPS & Seismic Hazard Figure A10–5 GPS convergence rate: ~0.8 +/- 0.5 mm/yr Characteristic earthquakes Charlevoix: M7 = 1/200 yr (std. 100-400 yr) Lower St Lawrence: M7 = 1/1000 yr (std. 400-20,000 yr)

  6. Figure A10–6 Conclusions • In Charlevoix and Lower St Lawrence, • GPS strain rates agree well with seismic strain rates CHV: 0.7 (+/- 0.4) mm/yr <=> 1.0 (+/- 0.5) mm/yr BSL: 0.2 (+/- 0.6) mm/yr <=> 0.2 (+/- 0.3) mm/yr 2) GPS data constrain the recurrence and magnitude of large earthquakes CHV: Mx ~7.8 (+/- 0.6) <=> T(M7) ~ 200 – 1000 yr BSL: Mx ~7.3 (+/- 1 ?) <=> T(M7) >> 400 yr

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