This data set contains velocity and strain rate fields over the northeast Tibetan Plateau, which are derived from Sentinel-1A and -1B synthetic aperture radar satellite data (SAR) and stored in GeoTIFF (.tif) or NETCDF (.grd) formats.
The velocities in the line-of-sights (LOS) of the satellites were processed at ~100 m resolution from time series in ~250km x 250km frames. The data set consists of velocities from 10 frames in ascending tracks and 13 frames in descending tracks of the satellites' orbits. The spatial extent of the velocities spans 96E-108E and 32N-43N, covering an area of 660,000 km^2. The temporal coverages of the data span from October 2014 to December 2019 across 65-110 acquisition epochs. The uncertainties of the velocities average to <1 mm/yr. The time series are inverted from fully-connected networks of short-temporal-baseline interferograms which are generated from interfering and unwrapping pairs of SAR imagery. The velocities represent the average velocity through the displacement time series.
The LOS velocities were decomposed into east and vertical velocities which are also archived with associated uncertainties. These Cartesian fields cover the overlapping areas between ascending and descending tracks and total 440,000 km^2. By combining the horizontal gradients of the filtered east velocities and interpolated north velocities from Global Navigational Satellite System, we derive second invariant, maximum shear, and dilatation strain rate fields for the same area with 1 km sampling intervals.
These strain rate fields highlight creeping sections and strain concentration on faults and fault junctions. The velocity fields reveal fault kinematics in terms of slip rates and partitioning. The vertical velocities also show non-tectonic signals such as subsidence related to permafrost melting, groundwater extraction, and reservoir loading, as well uplift from blocked drainages.
Proposed data to be included: Cartesian velocities and strain rate. This will form a demonstrator dataset for the potential inclusion of a larger dataset spanning the Alpine-Himalayan belt as part of the COMET LiCSAR project (https://comet.nerc.ac.uk/comet-lics-portal/)
Citable as: Ou, Q.; Daout, S.; Weiss, J.R.; Shen, L.; Lazecky, M.; Wright, T.; Parsons, B. (2022): Velocity and strain rate fields of the northeast Tibetan Plateau. NERC EDS Centre for Environmental Data Analysis, 26 May 2022. doi:10.5285/7fbb95c288af44ab8b40e74fef0e7cbc. https://dx.doi.org/10.5285/7fbb95c288af44ab8b40e74fef0e7cbc
Contact Details
c.s.watson@leeds.ac.uk
Dataset description
This data set contains velocity and strain rate fields over the northeast Tibetan Plateau, which are derived from Sentinel-1A and -1B synthetic aperture radar satellite data (SAR) and stored in GeoTIFF (.tif) or NETCDF (.grd) formats. The velocities in the line-of-sights (LOS) of the satellites were processed at ~100 m resolution from time series in ~250km x 250km frames. The data set consists of velocities from 10 frames in ascending tracks and 13 frames in descending tracks of the satellites' orbits. The spatial extent of the velocities spans 96E-108E and 32N-43N, covering an area of 660,000 km^2. The temporal coverages of the data span from October 2014 to December 2019 across 65-110 acquisition epochs. The uncertainties of the velocities average to <1 mm/yr. The time series are inverted from fully-connected networks of short-temporal-baseline interferograms which are generated from interfering and unwrapping pairs of SAR imagery. The velocities represent the average velocity through the displacement time series.
The LOS velocities were decomposed into east and vertical velocities which are also archived with associated uncertainties. These Cartesian fields cover the overlapping areas between ascending and descending tracks and total 440,000 km^2. By combining the horizontal gradients of the filtered east velocities and interpolated north velocities from Global Navigational Satellite System, we derive second invariant, maximum shear, and dilatation strain rate fields for the same area with 1 km sampling intervals. These strain rate fields highlight creeping sections and strain concentration on faults and fault junctions. The velocity fields reveal fault kinematics in terms of slip rates and partitioning. The vertical velocities also show non-tectonic signals such as subsidence related to permafrost melting, groundwater extraction, and reservoir loading, as well uplift from blocked drainages.
Proposed data to be included: Cartesian velocities and strain rate. This will form a demonstrator dataset for the potential inclusion of a larger dataset spanning the Alpine-Himalayan belt as part of the COMET LiCSAR project (https://comet.nerc.ac.uk/comet-lics-portal/)
Download: https://data.ceda.ac.uk/neodc/comet/publications_data/Ou_et_al_JGR_2022/v1.0/
Dataset owner: Qi Ou
Citable as: Ou, Q.; Daout, S.; Weiss, J.R.; Shen, L.; Lazecky, M.; Wright, T.; Parsons, B. (2022): Velocity and strain rate fields of the northeast Tibetan Plateau. NERC EDS Centre for Environmental Data Analysis, 26 May 2022. doi:10.5285/7fbb95c288af44ab8b40e74fef0e7cbc. https://dx.doi.org/10.5285/7fbb95c288af44ab8b40e74fef0e7cbc
Earth Engine Snippet if dataset already in GEE
Not in GEE
Enter license information
Open Government License: http://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/ 00README_catalogue_and_licence.txt
Keywords
SAR, Sentinel-1, InSAR, deformation, tectonics, permafrost, subsidence, groundwater
Code of Conduct