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| Titel |
Web-based Tsunami Early Warning System: a case study of the 2010 Kepulaunan Mentawai Earthquake and Tsunami |
| VerfasserIn |
E. Ulutas, A. Inan, A. Annunziato |
| 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 ; 12, no. 6 ; Nr. 12, no. 6 (2012-06-12), S.1855-1871 |
| Datensatznummer |
250010919
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| Publikation (Nr.) |
 copernicus.org/nhess-12-1855-2012.pdf |
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| Zusammenfassung |
| This study analyzes the response of the Global Disasters Alerts and
Coordination System (GDACS) in relation to a case study: the Kepulaunan
Mentawai earthquake and related tsunami, which occurred on 25 October 2010.
The GDACS, developed by the European Commission Joint Research Center,
combines existing web-based disaster information management systems with the
aim to alert the international community in case of major disasters. The
tsunami simulation system is an integral part of the GDACS. In more detail,
the study aims to assess the tsunami hazard on the Mentawai and Sumatra
coasts: the tsunami heights and arrival times have been estimated employing
three propagation models based on the long wave theory. The analysis was
performed in three stages: (1) pre-calculated simulations by using the
tsunami scenario database for that region, used by the GDACS system to
estimate the alert level; (2) near-real-time simulated tsunami forecasts,
automatically performed by the GDACS system whenever a new earthquake is
detected by the seismological data providers; and (3) post-event tsunami
calculations using GCMT (Global Centroid Moment Tensor) fault mechanism
solutions proposed by US Geological Survey (USGS) for this event. The
GDACS system estimates the alert level based on the first type of
calculations and on that basis sends alert messages to its users; the second
type of calculations is available within 30–40 min after the
notification of the event but does not change the estimated alert level. The
third type of calculations is performed to improve the initial estimations
and to have a better understanding of the extent of the possible damage. The
automatic alert level for the earthquake was given between Green and Orange
Alert, which, in the logic of GDACS, means no need or moderate need of
international humanitarian assistance; however, the earthquake generated 3 to 9 m tsunami run-up along southwestern coasts of the Pagai Islands where
431 people died. The post-event calculations indicated medium-high
humanitarian impacts. |
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