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Historical Seismograms - Evidence from the AD 2000 Izu Islands ...

Historical Seismograms - Evidence from the AD 2000 Izu Islands ...

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98 S. Stein, E. A. Okal and D. A. WiensFigure 9. Seismicity and focal mechanisms for <strong>the</strong> eastern Canadian passive margin(Stein et al., 1979). Earthquakes seaward of <strong>the</strong> 1000 m contour show thrust faulting;landward events show dominantly normal faulting. The mechanisms are consistent withreactivation of <strong>the</strong> continental margin rifting faults by flexure induced by deglaciation.The stress field at <strong>the</strong> margin due to differences in continent-ocean density structure alsopredicts <strong>the</strong> observed mechanisms.

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