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| Titel |
Lava emplacements at Shiveluch volcano (Kamchatka) from June 2011 to September 2014 observed by TanDEM-X SAR-Interferometry |
| VerfasserIn |
Alexandra Heck, Julia Kubanek, Malte Westerhaus, Ellen Gottschämmer, Bernhard Heck, Friedemann Wenzel |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250124898
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| Publikation (Nr.) |
 EGU/EGU2016-4401.pdf |
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| Zusammenfassung |
| As part of the Ring of Fire, Shiveluch volcano is one of the largest and most active volcanoes
on Kamchatka Peninsula. During the Holocene, only the southern part of the Shiveluch
massive was active. Since the last Plinian eruption in 1964, the activity of Shiveluch is
characterized by periods of dome growth and explosive eruptions. The recent active phase
began in 1999 and continues until today. Due to the special conditions at active volcanoes,
such as smoke development, danger of explosions or lava flows, as well as poor weather
conditions and inaccessible area, it is difficult to observe the interaction between dome
growth, dome destruction, and explosive eruptions in regular intervals. Consequently, a
reconstruction of the eruption processes is hardly possible, though important for a better
understanding of the eruption mechanism as well as for hazard forecast and risk
assessment.
A new approach is provided by the bistatic radar data acquired by the TanDEM-X satellite
mission. This mission is composed of two nearly identical satellites, TerraSAR-X and
TanDEM-X, flying in a close helix formation. On one hand, the radar signals penetrate clouds
and partially vegetation and snow considering the average wavelength of about
3.1 cm. On the other hand, in comparison with conventional InSAR methods, the
bistatic radar mode has the advantage that there are no difficulties due to temporal
decorrelation. By interferometric evaluation of the simultaneously recorded SAR
images, it is possible to calculate high-resolution digital elevation models (DEMs) of
Shiveluch volcano and its surroundings. Furthermore, the short recurrence interval of
11 days allows to generate time series of DEMs, with which finally volumetric
changes of the dome and of lava flows can be determined, as well as lava effusion
rates.
Here, this method is used at Shiveluch volcano based on data acquired between
June 2011 and September 2014. Although Shiveluch has a fissured topography
with steep slopes, DEMs with a resolution of about 6 m can be calculated and the
changes caused by volcanic activity can successfully be derived and quantified. |
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