Iceland Kinematics from InSAR
Large-scale ground deformation in Iceland is dominated by extensional plate-boundary deformation, where the Mid-Atlantic Ridge crosses the island, and by uplift due to glacial isostatic adjustment from thinning and retreat of glaciers. While this deformation is mostly steady over multiple years, it...
Published in: | Journal of Geophysical Research: Solid Earth |
---|---|
Main Authors: | , , |
Other Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
American Geophysical Union (AGU)
2023
|
Subjects: | |
Online Access: | http://hdl.handle.net/10754/681468 https://doi.org/10.1029/2022jb025546 |
id |
ftkingabdullahun:oai:repository.kaust.edu.sa:10754/681468 |
---|---|
record_format |
openpolar |
spelling |
ftkingabdullahun:oai:repository.kaust.edu.sa:10754/681468 2024-01-07T09:44:06+01:00 Iceland Kinematics from InSAR Cao, Yunmeng Jonsson, Sigurjon Hreinsdottir, S. Physical Science and Engineering (PSE) Division Earth Science and Engineering Program GNS Science , Lower Hutt New Zealand 2023-02-26T14:04:43Z application/pdf application/vnd.openxmlformats-officedocument.wordprocessingml.document http://hdl.handle.net/10754/681468 https://doi.org/10.1029/2022jb025546 unknown American Geophysical Union (AGU) DOI:10.5281/zenodo.7434807 https://onlinelibrary.wiley.com/doi/10.1029/2022JB025546 Cao, Y., Jónsson, S., & Hreinsdóttir, S. (2023). Iceland Kinematics from InSAR. Journal of Geophysical Research: Solid Earth. Portico. https://doi.org/10.1029/2022jb025546 doi:10.1029/2022jb025546 2169-9313 2169-9356 Journal of Geophysical Research: Solid Earth http://hdl.handle.net/10754/681468 Archived with thanks to Journal of Geophysical Research: Solid Earth Article 2023 ftkingabdullahun https://doi.org/10.1029/2022jb02554610.5281/zenodo.7434807 2023-12-09T20:20:38Z Large-scale ground deformation in Iceland is dominated by extensional plate-boundary deformation, where the Mid-Atlantic Ridge crosses the island, and by uplift due to glacial isostatic adjustment from thinning and retreat of glaciers. While this deformation is mostly steady over multiple years, it is modulated by smaller-scale transient deformation associated with e.g., earthquakes, volcanic unrest, and geothermal exploitation. Here we combine countrywide Sentinel-1 interferometric synthetic aperture radar (InSAR) data (from six tracks) from 2015 to 2021 with continuous GNSS observations to produce time-series of displacements across Iceland. The InSAR results were improved in a two-step tropospheric mitigation procedure, using (1) global atmospheric models to reduce long-wavelength and topography-correlated tropospheric signals, and (2) modeling of the stochastic properties of the residual troposphere. Our results significantly improve upon earlier country-wide InSAR results, which were based on InSAR stacking, as we use more data, better data weighting, and advanced InSAR corrections to produce time-series of ground displacements instead of just velocities. We fuse the three ascending and three descending track results to estimate maps of East and Up velocities, which clearly show the large-scale extension and GIA deformation. Using a revised plate-spreading and glacial isostatic adjustment models, based on these new ground velocity maps, we remove the large-scale and steady deformation from the InSAR time-series and analyze the remaining transient deformations. Our results demonstrate the importance of (1) mitigating InSAR tropospheric signals over Iceland and of (2) solving for time-series of deformation, not just velocities, as multiple transient deformation processes are present. We thank the editor and the anonymous reviewers for their many insightful comments and suggestions. We thank Dr He Tang and Dr Charles Williams for the discussions on GIA modeling. This research was supported by King Abdullah ... Article in Journal/Newspaper Iceland King Abdullah University of Science and Technology: KAUST Repository Mid-Atlantic Ridge New Ground ENVELOPE(-55.215,-55.215,49.567,49.567) Journal of Geophysical Research: Solid Earth 128 3 |
institution |
Open Polar |
collection |
King Abdullah University of Science and Technology: KAUST Repository |
op_collection_id |
ftkingabdullahun |
language |
unknown |
description |
Large-scale ground deformation in Iceland is dominated by extensional plate-boundary deformation, where the Mid-Atlantic Ridge crosses the island, and by uplift due to glacial isostatic adjustment from thinning and retreat of glaciers. While this deformation is mostly steady over multiple years, it is modulated by smaller-scale transient deformation associated with e.g., earthquakes, volcanic unrest, and geothermal exploitation. Here we combine countrywide Sentinel-1 interferometric synthetic aperture radar (InSAR) data (from six tracks) from 2015 to 2021 with continuous GNSS observations to produce time-series of displacements across Iceland. The InSAR results were improved in a two-step tropospheric mitigation procedure, using (1) global atmospheric models to reduce long-wavelength and topography-correlated tropospheric signals, and (2) modeling of the stochastic properties of the residual troposphere. Our results significantly improve upon earlier country-wide InSAR results, which were based on InSAR stacking, as we use more data, better data weighting, and advanced InSAR corrections to produce time-series of ground displacements instead of just velocities. We fuse the three ascending and three descending track results to estimate maps of East and Up velocities, which clearly show the large-scale extension and GIA deformation. Using a revised plate-spreading and glacial isostatic adjustment models, based on these new ground velocity maps, we remove the large-scale and steady deformation from the InSAR time-series and analyze the remaining transient deformations. Our results demonstrate the importance of (1) mitigating InSAR tropospheric signals over Iceland and of (2) solving for time-series of deformation, not just velocities, as multiple transient deformation processes are present. We thank the editor and the anonymous reviewers for their many insightful comments and suggestions. We thank Dr He Tang and Dr Charles Williams for the discussions on GIA modeling. This research was supported by King Abdullah ... |
author2 |
Physical Science and Engineering (PSE) Division Earth Science and Engineering Program GNS Science , Lower Hutt New Zealand |
format |
Article in Journal/Newspaper |
author |
Cao, Yunmeng Jonsson, Sigurjon Hreinsdottir, S. |
spellingShingle |
Cao, Yunmeng Jonsson, Sigurjon Hreinsdottir, S. Iceland Kinematics from InSAR |
author_facet |
Cao, Yunmeng Jonsson, Sigurjon Hreinsdottir, S. |
author_sort |
Cao, Yunmeng |
title |
Iceland Kinematics from InSAR |
title_short |
Iceland Kinematics from InSAR |
title_full |
Iceland Kinematics from InSAR |
title_fullStr |
Iceland Kinematics from InSAR |
title_full_unstemmed |
Iceland Kinematics from InSAR |
title_sort |
iceland kinematics from insar |
publisher |
American Geophysical Union (AGU) |
publishDate |
2023 |
url |
http://hdl.handle.net/10754/681468 https://doi.org/10.1029/2022jb025546 |
long_lat |
ENVELOPE(-55.215,-55.215,49.567,49.567) |
geographic |
Mid-Atlantic Ridge New Ground |
geographic_facet |
Mid-Atlantic Ridge New Ground |
genre |
Iceland |
genre_facet |
Iceland |
op_relation |
DOI:10.5281/zenodo.7434807 https://onlinelibrary.wiley.com/doi/10.1029/2022JB025546 Cao, Y., Jónsson, S., & Hreinsdóttir, S. (2023). Iceland Kinematics from InSAR. Journal of Geophysical Research: Solid Earth. Portico. https://doi.org/10.1029/2022jb025546 doi:10.1029/2022jb025546 2169-9313 2169-9356 Journal of Geophysical Research: Solid Earth http://hdl.handle.net/10754/681468 |
op_rights |
Archived with thanks to Journal of Geophysical Research: Solid Earth |
op_doi |
https://doi.org/10.1029/2022jb02554610.5281/zenodo.7434807 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
128 |
container_issue |
3 |
_version_ |
1787425435549696000 |