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Temporal monitoring of Bardarbunga volcanic activity with TanDEM-X

Rossi, Cristian and Minet, Christian and Fritz, Thomas and Eineder, Michael and Erten, Esra (2015) Temporal monitoring of Bardarbunga volcanic activity with TanDEM-X. AGU Fall Meeting 2015, 14-18 Dec 2015, San Francisco.

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On August 29, 2014, a volcanic activity started in the lava field of Holuhraun, at the north east of the Bardarbunga caldera in Iceland. The activity was declared finished on February 27, 2015, thus lasting for about 6 months. During these months the magma chamber below the caldera slowly emptied, causing the rare event of caldera collapse. In this scenario, TanDEM-X remote sensing data is of particular interest. By producing high-resolution and accurate elevation models of the caldera, it is possible to evaluate volume losses and topographical changes useful to increase the knowledge about the volcanic activity dynamics. 5 TanDEM-X InSAR acquisitions have been commanded between August 01, 2014 and November 08, 2014. 2 acquisitions have been commanded before the eruption and 3 acquisitions afterwards. To fully cover the volcanic activity, also the lava flow area at the north-west of the caldera has been monitored and a couple of acquisitions have been employed to reveal the subglacial graben structure and the lava path. In this context, the expected elevation accuracy is studied on two levels. Absolute height accuracy is analyzed by inspecting the signal propagation at X-band in the imaged medium. Relative height accuracy is analyzed by investigating the InSAR system parameters and the local geomorphology. It is shown how the system is very well accurate with mean height errors below the meter. Moreover, neither InSAR processing issues, e.g. phase unwrapping errors, nor complex DEM calibration aspects are problems to tackle. Caldera is imaged in its entirety and new cauldron formations and, in general, the complete restructuring of the glacial volcanic system is well represented. An impressive caldera volume loss of about 1 billion cubic meters is measured in about two months. The dyke propagation from the Bardarbunga cauldron to the Holuhraun lava field is also revealed and a graben structure with a width of up to 1 km and a sinking of a few meters is derived. These results show how TanDEM-X mission is capable to provide to emergency institutions and geophysicists reliable measures not easy to retrieve with on-site instruments.

Item URL in elib:https://elib.dlr.de/102463/
Document Type:Conference or Workshop Item (Speech)
Title:Temporal monitoring of Bardarbunga volcanic activity with TanDEM-X
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Rossi, Cristiancristian.rossi (at) dlr.deUNSPECIFIED
Minet, Christianchristian.minet (at) dlr.deUNSPECIFIED
Fritz, Thomasthomas.fritz (at) dlr.deUNSPECIFIED
Eineder, Michaelmichael.eineder (at) dlr.deUNSPECIFIED
Date:December 2015
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Keywords:TanDEM-X, DEM, Subglacial volcano, Iceland
Event Title:AGU Fall Meeting 2015
Event Location:San Francisco
Event Type:international Conference
Event Dates:14-18 Dec 2015
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Earth Observation
DLR - Research theme (Project):R - Projekt TanDEM-X (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Remote Sensing Technology Institute > SAR Signal Processing
Deposited By: Rossi, Cristian
Deposited On:25 Jan 2016 15:20
Last Modified:10 May 2016 23:43

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