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Title: Slip-rate measurements on the Karakorum Fault may imply secular variations in fault motion. Author: Chevalier ML, Ryerson FJ, Tapponnier P, Finkel RC, Van Der Woerd J, Haibing L, Qing L. Journal: Science; 2005 Jan 21; 307(5708):411-4. PubMed ID: 15662010. Abstract: 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.[Abstract] [Full Text] [Related] [New Search]