Lazecký, M, Hooper, AJ orcid.org/0000-0003-4244-6652 and Piromthong, P (2023) InSAR‐Derived Horizontal Velocities in a Global Reference Frame. Geophysical Research Letters, 50 (10). e2022GL101173. ISSN 0094-8276
Abstract
Interferometric Synthetic Aperture Radar is used to measure deformation rates over continents to constrain tectonic processes. The resulting velocity measurements are only relative, however, due to unknown integer ambiguities introduced during propagation of the signal through the atmosphere. These ambiguities mostly cancel when using spectral diversity to estimate along-track motion, allowing measurements to be made with respect to a global reference frame. Here, we calculate along-track velocities for a partial global data set of Sentinel-1 acquisitions and find good agreement with ITRF2014 plate motion model and measurements from GPS stations. We include corrections for solid-earth tides and gradients of ionospheric total electron content. Combining data from ascending and descending orbits we are able to estimate north and east velocities over 250 × 250 km areas and their accuracy of 4 and 23 mm/year, respectively. These “absolute” measurements can be particularly useful for global velocity and strain rate estimation where GNSS measurements are sparse.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2023. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Environment (Leeds) > School of Earth and Environment (Leeds) > Inst of Geophysics and Tectonics (IGT) (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 05 Jul 2023 14:33 |
Last Modified: | 05 Jul 2023 14:33 |
Published Version: | http://dx.doi.org/10.1029/2022gl101173 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1029/2022gl101173 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:200465 |