Using satellite radar amplitude imaging for monitoring syn-eruptive changes in surface morphology at an ice-capped stratovolcano
Satellite-based measurements of synthetic aperture radar amplitude provide a method for monitoring volcanoes during unrest and eruptions even when visual observations are not possible, for example due to poor weather or at night, and when radar phase measurements are noisy or decorrelated. Here, we...
Published in: | Remote Sensing of Environment |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://centaur.reading.ac.uk/75660/ https://centaur.reading.ac.uk/75660/1/Coto_amp_RSE_revised.pdf |
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ftunivreading:oai:centaur.reading.ac.uk:75660 2024-06-23T07:53:41+00:00 Using satellite radar amplitude imaging for monitoring syn-eruptive changes in surface morphology at an ice-capped stratovolcano Arnold, D. W. D. Biggs, J. Wadge, Geoff Mothes, P. 2018-05 text https://centaur.reading.ac.uk/75660/ https://centaur.reading.ac.uk/75660/1/Coto_amp_RSE_revised.pdf en eng Elsevier https://centaur.reading.ac.uk/75660/1/Coto_amp_RSE_revised.pdf Arnold, D. W. D., Biggs, J., Wadge, G. <https://centaur.reading.ac.uk/view/creators/90000255.html> and Mothes, P. (2018) Using satellite radar amplitude imaging for monitoring syn-eruptive changes in surface morphology at an ice-capped stratovolcano. Remote Sensing of the Environment, 209. pp. 480-488. ISSN 0034-4257 doi: https://doi.org/10.1016/j.rse.2018.02.040 <https://doi.org/10.1016/j.rse.2018.02.040> cc_by_nc_nd_4 Article PeerReviewed 2018 ftunivreading https://doi.org/10.1016/j.rse.2018.02.040 2024-06-11T15:07:33Z Satellite-based measurements of synthetic aperture radar amplitude provide a method for monitoring volcanoes during unrest and eruptions even when visual observations are not possible, for example due to poor weather or at night, and when radar phase measurements are noisy or decorrelated. Here, we use high resolution radar amplitude images from the TerraSAR-X and COSMO SkyMed satellites to investigate surface changes associated with explosive eruptions of Cotopaxi volcano, Ecuador in August 2015. We generate change difference and amplitude ratio maps spanning the start of explosive activity at Cotopaxi, which show complex spatial variations in radar amplitude both on and around the summit ice-cap that we attribute to a number of processes related to the eruption. Observed amplitude decreases are caused by crater deepening, ashfall onto ice and surface smoothing by ashfall onto slopes facing away from the satellite, while amplitude increases are due to deposition of coarse lapilli and wet tephra, increased soil saturation due to geothermally driven glacier melting, and smoothing of slopes facing towards the satellite. We discuss the potential applications of radar amplitude images for monitoring and hazard evaluation at active volcanoes. Article in Journal/Newspaper Ice cap CentAUR: Central Archive at the University of Reading Remote Sensing of Environment 209 480 488 |
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Open Polar |
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CentAUR: Central Archive at the University of Reading |
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ftunivreading |
language |
English |
description |
Satellite-based measurements of synthetic aperture radar amplitude provide a method for monitoring volcanoes during unrest and eruptions even when visual observations are not possible, for example due to poor weather or at night, and when radar phase measurements are noisy or decorrelated. Here, we use high resolution radar amplitude images from the TerraSAR-X and COSMO SkyMed satellites to investigate surface changes associated with explosive eruptions of Cotopaxi volcano, Ecuador in August 2015. We generate change difference and amplitude ratio maps spanning the start of explosive activity at Cotopaxi, which show complex spatial variations in radar amplitude both on and around the summit ice-cap that we attribute to a number of processes related to the eruption. Observed amplitude decreases are caused by crater deepening, ashfall onto ice and surface smoothing by ashfall onto slopes facing away from the satellite, while amplitude increases are due to deposition of coarse lapilli and wet tephra, increased soil saturation due to geothermally driven glacier melting, and smoothing of slopes facing towards the satellite. We discuss the potential applications of radar amplitude images for monitoring and hazard evaluation at active volcanoes. |
format |
Article in Journal/Newspaper |
author |
Arnold, D. W. D. Biggs, J. Wadge, Geoff Mothes, P. |
spellingShingle |
Arnold, D. W. D. Biggs, J. Wadge, Geoff Mothes, P. Using satellite radar amplitude imaging for monitoring syn-eruptive changes in surface morphology at an ice-capped stratovolcano |
author_facet |
Arnold, D. W. D. Biggs, J. Wadge, Geoff Mothes, P. |
author_sort |
Arnold, D. W. D. |
title |
Using satellite radar amplitude imaging for monitoring syn-eruptive changes in surface morphology at an ice-capped stratovolcano |
title_short |
Using satellite radar amplitude imaging for monitoring syn-eruptive changes in surface morphology at an ice-capped stratovolcano |
title_full |
Using satellite radar amplitude imaging for monitoring syn-eruptive changes in surface morphology at an ice-capped stratovolcano |
title_fullStr |
Using satellite radar amplitude imaging for monitoring syn-eruptive changes in surface morphology at an ice-capped stratovolcano |
title_full_unstemmed |
Using satellite radar amplitude imaging for monitoring syn-eruptive changes in surface morphology at an ice-capped stratovolcano |
title_sort |
using satellite radar amplitude imaging for monitoring syn-eruptive changes in surface morphology at an ice-capped stratovolcano |
publisher |
Elsevier |
publishDate |
2018 |
url |
https://centaur.reading.ac.uk/75660/ https://centaur.reading.ac.uk/75660/1/Coto_amp_RSE_revised.pdf |
genre |
Ice cap |
genre_facet |
Ice cap |
op_relation |
https://centaur.reading.ac.uk/75660/1/Coto_amp_RSE_revised.pdf Arnold, D. W. D., Biggs, J., Wadge, G. <https://centaur.reading.ac.uk/view/creators/90000255.html> and Mothes, P. (2018) Using satellite radar amplitude imaging for monitoring syn-eruptive changes in surface morphology at an ice-capped stratovolcano. Remote Sensing of the Environment, 209. pp. 480-488. ISSN 0034-4257 doi: https://doi.org/10.1016/j.rse.2018.02.040 <https://doi.org/10.1016/j.rse.2018.02.040> |
op_rights |
cc_by_nc_nd_4 |
op_doi |
https://doi.org/10.1016/j.rse.2018.02.040 |
container_title |
Remote Sensing of Environment |
container_volume |
209 |
container_start_page |
480 |
op_container_end_page |
488 |
_version_ |
1802645459431325696 |