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Earthquakes 1963-1995; m b > 4 Stein and Wysession, 2003 INTRAPLATE NARROW BOUNDARIES DIFFUSE BOUNDARY ZONES.

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Presentation on theme: "Earthquakes 1963-1995; m b > 4 Stein and Wysession, 2003 INTRAPLATE NARROW BOUNDARIES DIFFUSE BOUNDARY ZONES."— Presentation transcript:

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2 Earthquakes 1963-1995; m b > 4 Stein and Wysession, 2003 INTRAPLATE NARROW BOUNDARIES DIFFUSE BOUNDARY ZONES

3 From seismicity and current deformation patterns Inferred plate boundaries Gordon and Stein, 1992 Color scale: Green & Black: Stable Red: Unambiguous current deformation Orange: Likely current deformation (earthquakes) Yellow: Maybe current deformation (from plate cicuits)

4 relative plate velocities based on seafloor spreading rates and directions plus directions from earthquake slip vectors

5 NNR-NUVEL-1A http://sps.unavco.org/crustal_motion/dxdt/dxdt.html

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