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 ∼ 10.7 ± 0.7 millimeters per year. This rate is 10 times larger than that inferred from recent InSAR analyses (∼1 ± 3 millimeters per year) that span ∼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.
CITATION STYLE
Chevalier, M. L., Ryerson, F. J., Tapponnier, P., Finkel, R. C., Van Der Woerd, J., Haibing, L., & Qing, L. (2005). Slip-rate measurements on the Karakorum Fault may imply secular variations in fault motion. Science, 307(5708), 411–414. https://doi.org/10.1126/science.1105466
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