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Summary of Proposal GEO1475

TitleMonitoring Nyamulagira and Nyiragongo volcanoes (R.D. Congo) using TerraSAR-X interferometry
Investigator Kervyn, Francois - Royal Museum For Central Africa, Earth Science
Team Member
Dr. Kervyn, Francois - Royal Museum for Central Africa, Department of Earth Sciences
Dr. Albino, Fabien - Royal Museum for Central Africa, Department of Earth Sciences
Dr. d Oreye, Nicolas - National Museum of Natural History, European Center for. Geodynamics and Seismol, Department of Geophysics/Astrophysics (NMNH)
Mr. Smets, Benoit - European Center for Geodynamics and Seismology (ECGS), Department of Earth Sciences
SummaryProviding that enough SAR data are available, experience in developing countries with remote and/or politically unstable regions affected by volcanism showed that InSAR is one of the most reliable and sustainable ways to study volcanoes and their corresponding hazards. Thanks its high resolution and high repetition time acquisition TerraSAR-X mission provides unprecedented tools to monitor and study crustal deformation produced by landslides, earthquakes or volcanic activity. The project focuses on two highly active volcanoes, Nyiragongo and Nyamulagira, located on the Virunga Volcanic Province(VVP) in Central Africa. The project aims at assessing the use of TerraSAR-X data through a main objective: contributing to the monitoring of the volcanic area. The X-band radar images will be used for classical dInSAR ground deformation monitoring, provided that the temporal and perpendicular baselines are small enough to preserve the coherence over the vegetated areas. These dInSAR will also be used in combination with novel time series methods. The study area covers around 2500 km2,centered on the Nyiragongo-Nyamulagira volcanic system. Data are requested in StripMap mode Single Look Slant Range Complex data. Two SLC scenes are probably required to cover the area. To constrain different components of ground displacements (Up/Down & East/West), we need different orbital passes, at least one ascending and one descending for each location. For a monitoring task as well as because of the rapid decorrelation induced by the vegetation, the time duration between radar acquisitions is a key parameter and should be as short as possible. For these reasons, we request both ascending and descending acquisitions every 11 days. The work will be carried out with Institutes’own resources in the framework of ongoing projects. Software and computing hardware are already owned by the involved institutions. Meetings and working sessions can be easily organized between the collaborators, as all the institutes are located at very short distances from each other. Scientific deliverables will be (i) the production of catalogues of X-bands interferograms and correlation maps to follow respectively the ground deformations of Congo volcanoes and to map ground changes associated to new lava flows,(ii) the integration of these new interferometric products into multi-band and multi-sensor time series (starting from 2003) for ground deformation monitoring and (iii) the integration of a semi automated multi-tool for rapid modeling and inversion of deformation observed by InSAR called “TITANS” (Terrasar-x Interferometric Tools for African Nyiragongo/Nyamulagira volcanoes Survey).Such a tool will be developed in the frame of the current project for fast eruption warning response. Annual reports to DLR, publications of scientific papers and presentations in international scientific conferences will be also delivered.

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