InSAR slip rate determination on the Altyn Tagh Fault, northern Tibet, in the presence of topographically correlated atmospheric delays
Article first published online: 26 JUN 2008
Copyright 2008 by the American Geophysical Union.
Geophysical Research Letters
Volume 35, Issue 12, 28 June 2008
How to Cite
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., , , and (
- Issue published online: 26 JUN 2008
- Article first published online: 26 JUN 2008
- Manuscript Accepted: 12 MAY 2008
- Manuscript Revised: 8 MAY 2008
- Manuscript Received: 15 FEB 2008
- Altyn Tagh fault slip rate;
- continental deformation;
- InSAR interseismic
 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.