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The GITEWS ocean bottom sensor packages
O. Boebel1, M. Busack2, E. R. Flueh3, V. Gouretski1,*, H. Rohr2, A. Macrander1, A. Krabbenhoeft3, M. Motz4, and T. Radtke4
1Alfred Wegener Institute for Polar and Marine Research, Bussestr. 24, 27570 Bremerhaven, Germany
2OPTIMARE Sensorsysteme AG, Am Luneort 15a, 27572 Bremerhaven, Germany
3IFM-GEOMAR, Leibniz Institute for Marine Sciences, Wischhofstr. 1–3, 24148 Kiel, Germany
4develogic GmbH, Eiffestr. 598, 20537 Hamburg, Germany
*now at: Institut für Meereskunde, Bundesstr. 53, 20146 Hamburg, Germany
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Abstract. The German-Indonesian Tsunami Early Warning System (GITEWS) aims at reducing
the risks posed by events such as the 26 December 2004 Indian Ocean
tsunami. To minimize the lead time for tsunami alerts, to avoid false
alarms, and to accurately predict tsunami wave heights, real-time
observations of ocean bottom pressure from the deep ocean are required. As
part of the GITEWS infrastructure, the parallel development of two ocean
bottom sensor packages, PACT (Pressure based Acoustically Coupled
Tsunameter) and OBU (Ocean Bottom Unit), was initiated. The sensor package
requirements included bidirectional acoustic links between the bottom sensor
packages and the hosting surface buoys, which are moored nearby.
Furthermore, compatibility between these sensor systems and the overall
GITEWS data-flow structure and command hierarchy was mandatory. While PACT
aims at providing highly reliable, long term bottom pressure data only, OBU
is based on ocean bottom seismometers to concurrently record sea-floor
motion, necessitating highest data rates. This paper presents the technical
design of PACT, OBU and the HydroAcoustic Modem (HAM.node) which is used by
both systems, along with first results from instrument deployments off
Indonesia.
Full Article (PDF, 5438 KB) Special Issue
Citation: Boebel, O., Busack, M., Flueh, E. R., Gouretski, V., Rohr, H., Macrander, A., Krabbenhoeft, A., Motz, M., and Radtke, T.: The GITEWS ocean bottom sensor packages, Nat. Hazards Earth Syst. Sci., 10, 1759-1780, doi:10.5194/nhess-10-1759-2010, 2010. Bibtex EndNote Reference Manager XML
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