Natural Hazards and Earth System Science www.nat-hazards-earth-syst-sci.net 1561-8633 1684-9981 10 8 2010 10.5194/nhess-10-1759-2010 http://www.nat-hazards-earth-syst-sci.net/10/1759/2010/ http://www.nat-hazards-earth-syst-sci.net/10/1759/2010/nhess-10-1759-2010.html http://www.nat-hazards-earth-syst-sci.net/10/1759/2010/nhess-10-1759-2010.pdf 1759 1780 2010-08-31 The GITEWS ocean bottom sensor packages O. Boebel olaf.boebel@awi.de M. Busack E. R. Flueh V. Gouretski H. Rohr A. Macrander A. Krabbenhoeft M. Motz T. Radtke Alfred Wegener Institute for Polar and Marine Research, Bussestr. 24, 27570 Bremerhaven, Germany OPTIMARE Sensorsysteme AG, Am Luneort 15a, 27572 Bremerhaven, Germany IFM-GEOMAR, Leibniz Institute for Marine Sciences, Wischhofstr. 1–3, 24148 Kiel, Germany develogic GmbH, Eiffestr. 598, 20537 Hamburg, Germany now at: Institut für Meereskunde, Bundesstr. 53, 20146 Hamburg, Germany 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. Babeyko, A. Y., Hoechner, A., and Sobolev, S. V.: Source modeling and inversion with near real-time GPS: a GITEWS perspective for Indonesia, Nat. Hazards Earth Syst. Sci., 10, 1617–1627, doi:10.5194/nhess-10-1617-2010, 2010. 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