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See detailInSAR Applied to the Study of Active Volcanic and Seismic Areas in Africa
Wauthier, Christelle ULg

Doctoral thesis (2011)

Two active volcanic areas situated in immature portions of the East African Rift System (EARS): the Lake Kivu (Dem. Rep. of Congo) and Lake Natron (Tanzania) regions, which are located in the western and ... [more ▼]

Two active volcanic areas situated in immature portions of the East African Rift System (EARS): the Lake Kivu (Dem. Rep. of Congo) and Lake Natron (Tanzania) regions, which are located in the western and eastern branch, respectively, are still poorly known. Both areas indeed lack of ground-based networks, due to security problems or difficult field accessibility. The Lake Kivu area includes two volcanoes erupting frequently: the Nyamulagira and Nyiragongo volcanoes. The SAR database covering these volcanoes in- cludes data from JERS, ERS-1&2, ENVISAT, ALOS, RADARSAT-1&2 satellites back from year 1996. SAR Interferometry (InSAR) is thus applied to study the ground de- formations. MT-InSAR approaches, such as the ”‘StaMPS”’ method, are used to give us new complementary information to better constrain the previous established eruption models, or gain new insights on eruptions missed by the conventional InSAR, as well as on magmatic and tectonic activity. When enough constrains are available, the ground displacements are modeled using a 3D-Mixed Boundary Elements Method combined with a neighborhood algorithm. Hence, the 1996, 2002, 2004 and 2010 eruptions of Nyamu- lagira are modeled. The modeling results, coupled with the StaMPS MT-InSAR results, bring new insights concerning the magma plumbing system of this poorly known volcano and its eruptive mechanisms. The collapse of the eastern flank of Nyamulagira, along the NNW-trend fractures network linking Nyamulagira and Nyiragongo volcanoes, can also be identified. InSAR also captures the ground displacements associated with the January 2002 Nyiragongo eruption. The modeling of this major event evidences a deep magma intrusion beneath the Lake Kivu. Such intrusions should be taken into account for hazard assessment. The magma could indeed finds its way to the Lake Kivu floor, as evidenced by the presence of several old phreato-magmatic cones, and causes a lake overturn. The low dikes overpressures found in the North Kivu and Lake Natron areas indicate that, although the rift is considered as immature, the rift extension is driven by the supply of magma from depth, rather than by the tectonics. A new criterion to identify the rifting stage is found to be the stress state. In the southern part of the rift, tectonic activity dominates, indicating that the tectonics is probably driving the rift opening there. [less ▲]

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See detailSource parameters of the 2008 Bukavu-Cyangugu earthquake estimated from InSAR and teleseismic data
d'Oreye, Nicolas; Gonzalez, P.; Shuler, A. et al

in Geophysical Journal International (2011)

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See detailA new map of the lava flow field of Nyamulagira (D.R. Congo) from satellite imagery
Smets, Benoît; Wauthier, Christelle ULg; d'Oreye, N.

in Journal of African Earth Sciences (2010)

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See detailThe 2007 rifting event in Northern Tanzania studied by C and L-band interferometry
Oyen, Anneleen; Wauthier, Christelle ULg; d'Oreye, Nicolas et al

in ECGS Blue Books (2010)

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See detailModeling of InSAR displacements related with the January 2002 eruption of Nyiragongo volcano
Wauthier, Christelle ULg; Cayol, Valérie; Kervyn, François et al

in ECGS Blue Books (2010)

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See detailL-band and C-band studies of African volcanic areas
Wauthier, Christelle ULg; Oyen, A.; Marinkovic, P. et al

in Proc. of Geoscience and Remote Sensing Symposium, 2009 IEEE International, IGARSS 2009 , July 13-17 2009, Cape Town, Africa (2009)

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See detailThe January 2002 eruption of Nyiragongo volcano (DRC) captured by InSAR
Wauthier, Christelle ULg; Cayol, V.; Kervyn, F. et al

in Proc. of Geoscience and Remote Sensing Symposium, 2009 IEEE International, IGARSS 2009 , July 13-17 2009, Cape Town, Africa (2009)

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See detailSystematic InSAR monitoring of African active volcanic zones: What we have learned in three years, or an harvest beyond our expectations
Oreye, N.; Fernandez; Gonzalez, P. et al

in Proc. of 2008 Second workshop on USE of Remote Sensing techniques for Monitoring Volcanoes and Seismogenic Areas, Naples, Italy, 11-24 November 2008, doi: 10.1109/USEREST.2008.4740361 (2008)

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See detailStrain accommodation by slow slip and dyking in a youthful continental rift, East Africa
Calais, E.; d'Oreye, N.; Albaric, J. et al

in Nature (2008), 456

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