Surface deformation and source modeling of Ayaz-Akhtarma mud volcano, Azerbaijan, as detected by ALOS/ALOS-2 InSAR
Abstract Azerbaijan, located on the western edge of the Caspian Sea in Central Asia, has one of the highest populations of mud volcanoes in the world. We used satellite-based synthetic aperture radar (SAR) images derived from two L-band SAR satellites, ALOS/PALSAR along an ascending track from 2006...
Main Authors: | , |
---|---|
Format: | Article |
Language: | English |
Published: |
SpringerOpen
2018-10-01
|
Series: | Progress in Earth and Planetary Science |
Subjects: | |
Online Access: | http://link.springer.com/article/10.1186/s40645-018-0220-7 |
id |
doaj-cdce7148fa9646ee84b9f1145bb388f8 |
---|---|
record_format |
Article |
spelling |
doaj-cdce7148fa9646ee84b9f1145bb388f82020-11-25T00:09:23ZengSpringerOpenProgress in Earth and Planetary Science2197-42842018-10-015111610.1186/s40645-018-0220-7Surface deformation and source modeling of Ayaz-Akhtarma mud volcano, Azerbaijan, as detected by ALOS/ALOS-2 InSARKento Iio0Masato Furuya1Department of Natural History Sciences, Graduate School of Science, Hokkaido UniversityDepartment of Earth and Planetary Sciences, Faculty of Science, Hokkaido UniversityAbstract Azerbaijan, located on the western edge of the Caspian Sea in Central Asia, has one of the highest populations of mud volcanoes in the world. We used satellite-based synthetic aperture radar (SAR) images derived from two L-band SAR satellites, ALOS/PALSAR along an ascending track from 2006 to 2011, and its successor ALOS-2/PALSAR-2 along both ascending and descending tracks from 2014 to 2017. First, we applied interferometric SAR (InSAR) technique to detect surface displacements at the Ayaz-Akhtarma mud volcano in Azerbaijan. The 35 derived interferograms indicate that the deformation of the mud volcano is largely characterized by horizontal displacement. Besides the InSAR technique, we also used multiple-aperture interferometry (MAI) to derive the surface displacements parallel to the satellite flight direction to complement the InSAR data. Using the InSAR and MAI data, we obtained 3D displacements, which indicate that the horizontal displacement is dominant relative to subsidence and possible uplift. To explain the displacements, we performed source modeling, based on the assumption of elastic dislocation theory in a half space. The derived model consists of a convex surface on which normal-fault-type slips are semi-radially distributed, causing the significant horizontal displacements with minor subsidence. The convex source surface suggests that a steady overpressure system would be maintained by constantly intruding mud and gas.http://link.springer.com/article/10.1186/s40645-018-0220-7Mud volcanoSurface deformationGeodesyInterferometric synthetic aperture radarMultiple-aperture interferometryAdvanced Land Observing Satellite |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Kento Iio Masato Furuya |
spellingShingle |
Kento Iio Masato Furuya Surface deformation and source modeling of Ayaz-Akhtarma mud volcano, Azerbaijan, as detected by ALOS/ALOS-2 InSAR Progress in Earth and Planetary Science Mud volcano Surface deformation Geodesy Interferometric synthetic aperture radar Multiple-aperture interferometry Advanced Land Observing Satellite |
author_facet |
Kento Iio Masato Furuya |
author_sort |
Kento Iio |
title |
Surface deformation and source modeling of Ayaz-Akhtarma mud volcano, Azerbaijan, as detected by ALOS/ALOS-2 InSAR |
title_short |
Surface deformation and source modeling of Ayaz-Akhtarma mud volcano, Azerbaijan, as detected by ALOS/ALOS-2 InSAR |
title_full |
Surface deformation and source modeling of Ayaz-Akhtarma mud volcano, Azerbaijan, as detected by ALOS/ALOS-2 InSAR |
title_fullStr |
Surface deformation and source modeling of Ayaz-Akhtarma mud volcano, Azerbaijan, as detected by ALOS/ALOS-2 InSAR |
title_full_unstemmed |
Surface deformation and source modeling of Ayaz-Akhtarma mud volcano, Azerbaijan, as detected by ALOS/ALOS-2 InSAR |
title_sort |
surface deformation and source modeling of ayaz-akhtarma mud volcano, azerbaijan, as detected by alos/alos-2 insar |
publisher |
SpringerOpen |
series |
Progress in Earth and Planetary Science |
issn |
2197-4284 |
publishDate |
2018-10-01 |
description |
Abstract Azerbaijan, located on the western edge of the Caspian Sea in Central Asia, has one of the highest populations of mud volcanoes in the world. We used satellite-based synthetic aperture radar (SAR) images derived from two L-band SAR satellites, ALOS/PALSAR along an ascending track from 2006 to 2011, and its successor ALOS-2/PALSAR-2 along both ascending and descending tracks from 2014 to 2017. First, we applied interferometric SAR (InSAR) technique to detect surface displacements at the Ayaz-Akhtarma mud volcano in Azerbaijan. The 35 derived interferograms indicate that the deformation of the mud volcano is largely characterized by horizontal displacement. Besides the InSAR technique, we also used multiple-aperture interferometry (MAI) to derive the surface displacements parallel to the satellite flight direction to complement the InSAR data. Using the InSAR and MAI data, we obtained 3D displacements, which indicate that the horizontal displacement is dominant relative to subsidence and possible uplift. To explain the displacements, we performed source modeling, based on the assumption of elastic dislocation theory in a half space. The derived model consists of a convex surface on which normal-fault-type slips are semi-radially distributed, causing the significant horizontal displacements with minor subsidence. The convex source surface suggests that a steady overpressure system would be maintained by constantly intruding mud and gas. |
topic |
Mud volcano Surface deformation Geodesy Interferometric synthetic aperture radar Multiple-aperture interferometry Advanced Land Observing Satellite |
url |
http://link.springer.com/article/10.1186/s40645-018-0220-7 |
work_keys_str_mv |
AT kentoiio surfacedeformationandsourcemodelingofayazakhtarmamudvolcanoazerbaijanasdetectedbyalosalos2insar AT masatofuruya surfacedeformationandsourcemodelingofayazakhtarmamudvolcanoazerbaijanasdetectedbyalosalos2insar |
_version_ |
1725412145088167936 |