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| Titel |
Real-time earthquake monitoring for tsunami warning in the Indian Ocean and beyond |
| VerfasserIn |
W. Hanka, J. Saul, B. Weber, J. Becker, P. Harjadi, Fauzi, GITEWS Seismology Group |
| 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 ; 10, no. 12 ; Nr. 10, no. 12 (2010-12-20), S.2611-2622 |
| Datensatznummer |
250008540
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| Publikation (Nr.) |
 copernicus.org/nhess-10-2611-2010.pdf |
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| Zusammenfassung |
| The Mw = 9.3 Sumatra earthquake of 26 December 2004 generated a tsunami
that affected the entire Indian Ocean region and caused approximately
230 000 fatalities. In the response to this tragedy the German government
funded the German Indonesian Tsunami Early Warning System (GITEWS) Project.
The task of the GEOFON group of GFZ Potsdam was to develop and implement the
seismological component. In this paper we describe the concept of the GITEWS
earthquake monitoring system and report on its present status. The major
challenge for earthquake monitoring within a tsunami warning system is to
deliver rapid information about location, depth, size and possibly other
source parameters. This is particularly true for coast lines adjacent to the
potential source areas such as the Sunda trench where these parameters are
required within a few minutes after the event in order to be able to warn
the population before the potential tsunami hits the neighbouring coastal
areas. Therefore, the key for a seismic monitoring system with short warning
times adequate for Indonesia is a dense real-time seismic network across
Indonesia with densifications close to the Sunda trench. A substantial
number of supplementary stations in other Indian Ocean rim countries are
added to strengthen the teleseismic monitoring capabilities. The
installation of the new GITEWS seismic network – consisting of 31 combined
broadband and strong motion stations – out of these 21 stations in
Indonesia – is almost completed. The real-time data collection is using a
private VSAT communication system with hubs in Jakarta and Vienna. In
addition, all available seismic real-time data from the other seismic
networks in Indonesia and other Indian Ocean rim countries are acquired also
directly by VSAT or by Internet at the Indonesian Tsunami Warning Centre in
Jakarta and the resulting "virtual" network of more than 230 stations can
jointly be used for seismic data processing. The seismological processing
software as part of the GITEWS tsunami control centre is an enhanced version
of the widely used SeisComP software and the well established GEOFON
earthquake information system operated at GFZ in Potsdam
(http://geofon.gfz-potsdam.de/db/eqinfo.php). This recently developed
software package (SeisComP3) is reliable, fast and can provide fully
automatic earthquake location and magnitude estimates. It uses innovative
visualization tools, offers the possibility for manual correction and
re-calculation, flexible configuration, support for distributed processing
and data and parameter exchange with external monitoring systems. SeisComP3
is not only used for tsunami warning in Indonesia but also in most other
Tsunami Warning Centres in the Indian Ocean and Euro-Med regions and in many
seismic services worldwide. |
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