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GEOPHYSICAL RESEARCH LETTERS,
VOL. 35,
L12309,
5 PP., 2008
doi:10.1029/2008GL033659
InSAR slip rate determination on the Altyn Tagh Fault, northern Tibet, in the presence of topographically correlated atmospheric delays
COMET, Department of Earth Sciences, University of Oxford, Oxford, UK
COMET, Department of Earth Sciences, University of Oxford, Oxford, UK
COMET, Department of Earth Sciences, University of Oxford, Oxford, UK
COMET, School of Earth and Environmental Sciences, University of Leeds, Leeds, UK
The interseismic strain across the Altyn Tagh Fault at 85°E has been measured using 59 interferograms from 26 ERS-1/2 SAR acquisitions on a single track for the period 1993–2000. Using an atmospheric delay correction that scales linearly with height, we estimate the left-lateral strike-slip motion to be 11 ±1σ 5 mm/yr, assuming no relative vertical motion and a 15 km fault locking depth. This is in agreement with sparse GPS measurements. The atmospheric delay corrections agree well with coarse contemporaneous modelled weather data, reinforcing the importance of correcting for atmospheric delays in InSAR studies of interseismic strain accumulation, particularly in areas of high topographic relief that strongly correlate with the expected tectonic signal. We also find that, in addition to the tropospheric water vapour ‘wet’ delay, the hydrostatic ‘dry’ delay makes a significant contribution to the signal.
Received 15 February 2008; accepted 12 May 2008; published 26 June 2008.
Citation: (2008), InSAR slip rate determination on the Altyn Tagh Fault, northern Tibet, in the presence of topographically correlated atmospheric delays, Geophys. Res. Lett., 35, L12309, doi:10.1029/2008GL033659.
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