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| Titel |
Inflation of the Aira Caldera (Japan) detected over Kokubu urban area using SAR interferometry ERS data |
| VerfasserIn |
D. Remy, S. Bonvalot, M. Murakami, P. Briole, S. Okuyama |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1815-381X
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| Digitales Dokument |
URL |
| Erschienen |
In: eEarth ; 2, no. 1 ; Nr. 2, no. 1 (2007-02-02), S.17-25 |
| Datensatznummer |
250000410
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| Publikation (Nr.) |
 copernicus.org/ee-2-17-2007.pdf |
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| Zusammenfassung |
| Nine ERS-1 and ERS-2 descending orbit data acquired over Aira Caldera
between June 1995 and November 1998 were used to create 36 differential
interferograms. Although the interferograms exhibit a relatively low level
of coherence, even for couples sampling short time intervals (6 months),
Synthetique Aperture Radar (SAR) observations reveal a distinct range change
pattern over Kokubu urban area whose amplitude increases with the time
separation between SAR images. The analysis of the ground deformation time
series relative to the earliest ERS images showed a maximum uplift of about
20 mm between the north and the south of the urban area during the period
covered by our satellite observations. Taking the reduced surface of the
coherent area into account, we performed a simple modeling of the
deformation field assuming an inflating spherical source within an elastic
half-space medium located beneath the centre of the Aira Caldera. This
simple model predicts a maximum volume increase of 20–30×106 m3
between 1995 and 1998, which would produce an inflation of about 70 mm at
the centre of the Aira Caldera and 40 mm in the Kokubu south urban area.
These results are in good agreement with other geophysical observations
carried out on the Aira caldera during this period. Despite the limited
spatial extent of the coherent areas around the Aira Caldera, this study
shows that DinSAR method using data collected in C band can be successfully
used to detect subtle ground displacement changes of the volcanic complex
and thus provides complementary information to ground-based geodetic
monitoring of dynamic processes of the Aira Caldera and Sakurajima volcano. |
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