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NRC Workshop on Mmax in the Central and Eastern U.S. EQ Hazards Workshop September 9-10, 2007

Figure A8–1. NRC Workshop on Mmax in the Central and Eastern U.S. EQ Hazards Workshop September 9-10, 2007. USGS, Golden, CO U.S. Department of the Interior U.S. Geological Survey. Figure A8–2. Walter D. Mooney USGS-Menlo Park Mmax in Cratons Outline: Introduction Continental Evolution

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NRC Workshop on Mmax in the Central and Eastern U.S. EQ Hazards Workshop September 9-10, 2007

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  1. Figure A8–1 NRC Workshop on Mmax in the Central and Eastern U.S.EQ Hazards WorkshopSeptember 9-10, 2007 USGS, Golden, CO U.S. Department of the Interior U.S. Geological Survey

  2. Figure A8–2 • Walter D. Mooney USGS-Menlo Park • Mmax in Cratons • Outline: • Introduction • Continental Evolution • Earthquakes and Tectonics • Lithospheric Structure • Lith-EQ Correlation (Mmax) • Conclusion: Mmax = 6.8 (?)

  3. Figure A8–3 North American Geology

  4. Figure A8–4 3.0 Ga (Archean): Formation of Cratons Diamonds form here

  5. Figure A8–5 2.0 Ga (Early Proterozoic): Suturing of Cratonic Blocks

  6. Figure A8–6 1.0 Ga (Late Proterozoic): Mantle Metasomatism at Lithospheric Suture, Intraplate Zone of Weakness Earthquake

  7. Figure A8–7 • Schulte, S. M., and Mooney, W. D., 2005, An updated global earthquake catalogue for stable continental regions: reassessing the correlation with ancient rifts: Geophysical Journal International, v. 161, p. 707-721.

  8. Figure A8–8 Extended margin earthquakes. Red circles denote earthquakes that are associated with extended margins, green circles denote events that are possibly associated with extended margins. Regions of concentrated seismicity are numbered.

  9. Figure A8–9 Interior rift earthquakes. Red circles identify earthquakes that are associated with interior rifts, green circles identify events that are possibly associated with interior rifts. Regions of concentrated seismicity are numbered.

  10. Figure A8–10 Non extended crust earthquakes. Earthquakes are indicated with blue circles. Regions of concentrated seismicity are numbered.

  11. Figure A8–11 Figure 9. Eastern United States, taken from the Exxon tectonic map of the world [Exxon, 1985]. Rifts have been highlighted in red and blue. Earthquakes from the database have been plotted on top. Red circles denote events associated with extended crust, green circles denote events that might be associated with extended crust. Events that occurred within non-extended crust are indicated in blue. Earthquakes that occurred within the St. Lawrence depression are indicated in orange.

  12. Figure A8–12 Lithospheric Root

  13. Figure A8–13 Model of Precambrian Lithosphere

  14. Figure A8–14 Lithosphere is Generally in a State of Failure Equilibrium

  15. Figure A8–15 Tomographic Model 6,000 5,600 5,200 4,800 4,400 4,000 3,600

  16. Figure A8–16

  17. Figure A8–17

  18. Figure A8–18 Number of Earthquakes

  19. Figure A8–19 Number of Earthquakes

  20. Figure A8–20 Number of Earthquakes

  21. Figure A8–21 Number of Earthquakes

  22. Figure A8–22 Magnitude of Earthquakes

  23. Figure A8–23

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