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| Titel |
GPS water level measurements for Indonesia's Tsunami Early Warning System |
| VerfasserIn |
T. Schöne, W. Pandoe, I. Mudita, S. Roemer, J. Illigner, C. Zech, R. Galas |
| 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. 3 ; Nr. 11, no. 3 (2011-03-09), S.741-749 |
| Datensatznummer |
250009255
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| Publikation (Nr.) |
 copernicus.org/nhess-11-741-2011.pdf |
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| Zusammenfassung |
On Boxing Day 2004, a severe tsunami was generated by a strong earthquake in
Northern Sumatra causing a large number of casualties. At this time, neither
an offshore buoy network was in place to measure tsunami waves, nor a system
to disseminate tsunami warnings to local governmental entities. Since then,
buoys have been developed by Indonesia and Germany, complemented by NOAA's
Deep-ocean Assessment and Reporting of Tsunamis (DART) buoys, and have been
moored offshore Sumatra and Java. The suite of sensors for offshore tsunami
detection in Indonesia has been advanced by adding GPS technology for water level
measurements.
The usage of GPS buoys in tsunami warning systems is a relatively new
approach. The concept of the German Indonesian Tsunami Early Warning System
(GITEWS) (Rudloff et al., 2009) combines GPS technology and ocean bottom
pressure (OBP) measurements. Especially for near-field installations where
the seismic noise may deteriorate the OBP data, GPS-derived sea level heights
provide additional information.
The GPS buoy technology is precise enough to detect medium to large tsunamis
of amplitudes larger than 10 cm. The analysis presented here suggests that
for about 68% of the time, tsunamis larger than 5 cm may be detectable. |
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