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IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS002 Poster presentation 1788 The potential use of coastal tide gauge data in the Australian Tsunami Warning System Mr. Stewart Allen Bureau of Meteorology Research Centre Australian Bureau of Meteorology IASPEI Diana Greenslade The Australian Bureau of Meteorology (the Bureau), in conjunction with Geoscience Australia is currently developing an operational tsunami warning system. One planned component of this warning system is to run a numerical tsunami model in real-time, initialised with seismic information and assimilating sealevel data. DART buoys are typically located offshore in deep water and provide an ideal data stream that can be assimilated into a tsunami propagation model. The Bureau is currently also expanding and enhancing its coastal tide gauge network. These tide gauges provide another data stream that can be used for model verification and could potentially also be used for data assimilation. Tide gauges are almost always in enclosed harbours, bays or ports and the variability seen in tide gauge records of tsunamis will contain variability due to the tsunami interacting with the local small-scale topography, e.g. shoaling, seiching, reflections, diffraction, refraction, wave-breaking etc. These effects are not represented in the relatively coarse resolution of a tsunami propagation model. The relationship between the signal of a tsunami at a tide gauge and the offshore wave is strongly dependent on location and determining the relationship between the two is a challenge. There is therefore a need to analyse the tide gauge signal and location to determine what, if any, characteristics of a tsunami can be extracted from the observed signal and used for model verification and/or assimilation. In this presentation, initial results from an analysis of some existing Australian tide gauge data will be presented. Keywords: tsunami, tideguage, modelling
IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy (S) - IASPEI - International Association of Seismology and Physics of the Earth's Interior JSS002 Poster presentation 1789 Tsunami sources of November 2006 and January 2007 Kuril earthquakes Dr. Yushiro Fujii IISEE Building Research Institute IASPEI Kenji Satake We have performed tsunami simulations for the Kuril earthquakes which occurred on November 15, 2006 (46.577N, 153.247E, Mw=8.3 at 11:14:16 UTC according to USGS) and January 13, 2007 (46.288N, 154.448E, Mw=8.2 at 04:23:20 UTC according to USGS), and found that the seismic moment of the Nov. 2006 event was larger than that of the Jan. 2007 event. The tsunamis generated by these two earthquakes were recorded at many tide gauge stations located in and around the Pacific Ocean. The DART buoy systems installed and operated in deep oceans by National Oceanic & Atmospheric Administration (NOAA) also captured these tsunamis. We have collected and downloaded the tide records at 90 or more stations from Japan Meteorological Agency (JMA), Japan Coast Guard (JCG), Geographical Survey Institute (GSI), Sakhalin Tsunami Warning Center (STWC), West Coast & Alaska Tsunami Warning Center (WCATWC), NOAA and their web sites. The observed tsunami records indicate that the Nov. 2006 tsunami was twice or three times larger than that of the Jan. 2007 tsunami. For the tsunami simulation, we adopted the following fault models. For the Nov. 2006 event, the fault model is based on Global CMT solution (strike: 214, dip: 15, rake: 90, length: 200 km, width: 100 km, average slip: 4 m, rise time (source duration): 100 s) . For the Jan. 2007 event, the fault model is based on Yagis model (strike: 215, dip: 45, rake: -110, length: 160 km, width: 40 km, average slip: 5 m, rise time: 50 s). The seismic moment ratio for these fault parameters is 2.5:1, assuming the same rigidity. The computed tsunami waveforms from the above fault models explain well the observed ones at most of tide and DART stations, indicating that the seismic moment of the Nov. 2006 event was twice or third times larger than the Jan. 2007 event. Keywords: kuril earthquake, tsunami source, tide gauge data
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IUGG XXIV General Assembly July 2-13, 2007 Perugia, Italy<br />
(S) - <strong>IASPEI</strong> - International Association of Seismology and Physics of the Earth's<br />
Interior<br />
JSS002 Poster presentation 1789<br />
Tsunami sources of November 2006 and January 2007 Kuril earthquakes<br />
Dr. Yushiro Fujii<br />
IISEE Building Research Institute <strong>IASPEI</strong><br />
Kenji Satake<br />
We have performed tsunami simulations for the Kuril earthquakes which occurred on November 15,<br />
2006 (46.577N, 153.247E, Mw=8.3 at 11:14:16 UTC according to USGS) and January 13, 2007<br />
(46.288N, 154.448E, Mw=8.2 at 04:23:20 UTC according to USGS), and found that the seismic moment<br />
of the Nov. 2006 event was larger than that of the Jan. 2007 event. The tsunamis generated by these<br />
two earthquakes were recorded at many tide gauge stations located in and around the Pacific Ocean.<br />
The DART buoy systems installed and operated in deep oceans by National Oceanic & Atmospheric<br />
Administration (NOAA) also captured these tsunamis. We have collected and downloaded the tide<br />
records at 90 or more stations from Japan Meteorological Agency (JMA), Japan Coast Guard (JCG),<br />
Geographical Survey Institute (GSI), Sakhalin Tsunami Warning Center (STWC), West Coast & Alaska<br />
Tsunami Warning Center (WCATWC), NOAA and their web sites. The observed tsunami records indicate<br />
that the Nov. 2006 tsunami was twice or three times larger than that of the Jan. 2007 tsunami. For the<br />
tsunami simulation, we adopted the following fault models. For the Nov. 2006 event, the fault model is<br />
based on Global CMT solution (strike: 214, dip: 15, rake: 90, length: 200 km, width: 100 km, average<br />
slip: 4 m, rise time (source duration): 100 s) . For the Jan. 2007 event, the fault model is based on<br />
Yagis model (strike: 215, dip: 45, rake: -110, length: 160 km, width: 40 km, average slip: 5 m, rise<br />
time: 50 s). The seismic moment ratio for these fault parameters is 2.5:1, assuming the same rigidity.<br />
The computed tsunami waveforms from the above fault models explain well the observed ones at most<br />
of tide and DART stations, indicating that the seismic moment of the Nov. 2006 event was twice or third<br />
times larger than the Jan. 2007 event.<br />
Keywords: kuril earthquake, tsunami source, tide gauge data
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