Slip-rate measurements on the Karakorum Fault may imply secular variations in fault motion

  • Chevalier M
  • Ryerson F
  • Tapponnier P
 et al. 
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Beryllium-10 surface exposure dating of offset moraines on one branch of the Karakorum Fault west of the Gar basin yields a long-term (140- to 20-thousand-year) right-lateral slip rate of approximately 10.7 +/- 0.7 millimeters per year. This rate is 10 times larger than that inferred from recent InSAR analyses ( approximately 1 +/- 3 millimeters per year) that span approximately 8 years and sample all branches of the fault. The difference in slip-rate determinations suggests that large rate fluctuations may exist over centennial or millennial time scales. Such fluctuations would be consistent with mechanical coupling between the seismogenic, brittle-creep, and ductile shear sections of faults that reach deep into the crust.

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  • M. L. Chevalier

  • F. J. Ryerson

  • P. Tapponnier

  • R. C. Finkel

  • J. Van Der Woerd

  • Li Haibing

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