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      Constraints on the geomorphological evolution of the nested summit craters of Láscar volcano from high spatio-temporal resolution TerraSAR-X interferometry

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          Toward mapping surface deformation in three dimensions using InSAR

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            A satellite geodetic survey of large-scale deformation of volcanic centres in the central Andes.

            Surface deformation in volcanic areas usually indicates movement of magma or hydrothermal fluids at depth. Stratovolcanoes tend to exhibit a complex relationship between deformation and eruptive behaviour. The characteristically long time spans between such eruptions requires a long time series of observations to determine whether deformation without an eruption is common at a given edifice. Such studies, however, are logistically difficult to carry out in most volcanic arcs, as these tend to be remote regions with large numbers of volcanoes (hundreds to even thousands). Here we present a satellite-based interferometric synthetic aperture radar (InSAR) survey of the remote central Andes volcanic arc, a region formed by subduction of the Nazca oceanic plate beneath continental South America. Spanning the years 1992 to 2000, our survey reveals the background level of activity of about 900 volcanoes, 50 of which have been classified as potentially active. We find four centres of broad (tens of kilometres wide), roughly axisymmetric surface deformation. None of these centres are at volcanoes currently classified as potentially active, although two lie within about 10 km of volcanoes with known activity. Source depths inferred from the patterns of deformation lie between 5 and 17 km. In contrast to the four new sources found, we do not observe any deformation associated with recent eruptions of Lascar, Chile.
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              The 1883 eruption of Krakatau

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                Author and article information

                Journal
                Bulletin of Volcanology
                Bull Volcanol
                Springer Nature
                0258-8900
                1432-0819
                March 2018
                February 10 2018
                March 2018
                : 80
                : 3
                Article
                10.1007/s00445-018-1195-3
                a42206f8-7dbd-479b-9e4e-7f26f80c85db
                © 2018

                http://www.springer.com/tdm

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