2002 Denver Annual Meeting (October 27-30, 2002)

Paper No. 10
Presentation Time: 4:10 PM


TAYLOR, Mike1, PELTZER, Gilles1, YIN, An1, RYERSON, F.J.2, FINKEL, Robert3 and DING, Lin4, (1)Earth and Space Sciences, UCLA, Los Angeles, CA 90095, (2)Center of Accelerator Mass Spectrometry, Lawerence Livermore National Laboratory, Livermore, CA, (3)Center of Accelerator Mass Spectrometry, Lawerence Livermore National Lab, Livermore, CA, (4)Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, 100029, China, mtaylor@ess.ucla.edu

We use a combination of repeat-pass synthetic aperture radar interferometry (InSAR) and cosmogenic dating to characterize the slip-history along the Dong Co conjugate fault system in Central Tibet. The Dong Co conjugate fault system is centered along the E-trending Bangong-Nujiang suture zone. The conjugate fault system is comprised of the NE-striking left-slip Riganpei Co fault to the north and NW-striking right-slip Gyaring Co fault to the south. These structures accommodate a portion of Indo-Asian convergence and long term slip-rates determined along these faults indicate north-south contraction is occurring across Central Tibet at a rate of ~2 mm/yr. Preliminary interferograms were constructed using descending orbital tracks of the ERS 1 and ERS 2 European Space Agency satellites with a time-span of seven years. Surface displacement maps along the radar line of sight indicate a significant strain gradient from the NW to SE centered along the Riganpei Co fault, and is consistent with left-slip. Our preliminary InSAR results are consistent with geologic observations and suggest little variation in the near-field strain rate since about 7 ka.