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| Titel |
Detection of the 2010 Chilean tsunami using satellite altimetry |
| VerfasserIn |
B. D. Hamlington, R. R. Leben, O. A. Godin, J. F. Legeais, E. Gica, V. V. Titov |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 11, no. 9 ; Nr. 11, no. 9 (2011-09-01), S.2391-2406 |
| Datensatznummer |
250009665
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| Publikation (Nr.) |
 copernicus.org/nhess-11-2391-2011.pdf |
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| Zusammenfassung |
| Tsunamis are difficult to detect and measure in the open ocean because the
wave amplitude is much smaller than it is closer to shore. An effective
early warning system, however, must be able to observe an impending tsunami
threat far away from the shore in order to provide the necessary lead-time
for coastal inhabitants to find safety. Given the expansiveness of the
ocean, sensors capable of detecting the tsunami must also have very broad
areal coverage. The 2004 Sumatra-Andaman tsunami was definitively detected
in the open ocean from both sea surface height and sea surface roughness
measurements provided by satellite altimeters. This tsunami, however, was
exceptionally strong and questions remain about the ability to use such
measurements for the detection of weaker tsunamis. Here we study the 2010 Chilean tsunami and demonstrate the ability to detect the tsunami in the
open ocean. Specifically, we analyze the utility of filtering in extracting
the tsunami signal from sea surface height measurements, and, through the
use of statistical analyses of satellite altimeter observations, we
demonstrate that the 2010 Chilean tsunami induced distinct and detectable
changes in sea surface roughness. While satellite altimeters do not provide
the temporal and spatial coverage necessary to form the basis of an
effective early warning system, tsunami-induced changes in sea surface
roughness can be detected using orbiting microwave radars and radiometers,
which have a broad surface coverage across the satellite ground track. |
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