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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 1816 Tsunami detection by wavelet analysis of DART records Dr. Victor Morozov Tsunami laboratory 117997 Moscow, Russia, Nakhimovskiy ave 36 IASPEI Wavelet analysis has been applied to bottom pressure DART records for detection tsunami signals related to seismic events from 1986 to 2007 in Pacific Ocean. Wavelet analysis of the bottom pressure oscillations reveals that the high frequency components of tsunami signals were markedly dispersive. The observed dispersion was found to be in a good agreement with theoretical estimates of the dispersion derived from the group velocity of the waves. Keywords: dart, tsunami, dispersion

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 1817 Numerical experiment of the oil spread caused by the 1964 Niigata Earthquake Tsunami Dr. Yoko Iwabuchi Civil Eng. Tohoku Univ. Shun-Ichi Koshimura, Fumihiko Imamura A complex tsunami damage involving floating objects driven by a tsunami is a new aspect of tsunami disaster in industrialize coastal region. The most commonly observed feature of this complex tsunami disaster is that the destruction of storage of flammable materials by collision with tsunami-driven objects or by the hydrodynamic force of tsunami may result spread of large fires, flammable materials such as spilled oil and ignited material advected and diffused by the tsunami current in a harbor or on inundated land. In the 1964 Niigata Earthquake,oil were leaked from tanks in coastal industrial region. The tsunami inundation flow which was happen subsequently cause expansion of oil spreading and fire damage(Iwabuchi et al. 2006). Despite of the risk of all industrialize coastal region and the significance of the damage by tsunami, little has been done on estimating the complex damage to waterfronts. Current situation of estimatiing tsunami damage is based only on counting assets possibly exposed in a tsunami inundation zone, so the features of complex tsunami disaster is not well understood. We have developed the water-oil 2-layer model to draw up disaster-affected scenario for disaster prevention planning or as a tool for designing of oil dike. Here, we conduct a numerical experiment of the oil spread caused by the past tsunami event. Firstly, the simulation of propagation and run-up for the 1964 Niigata Earthquake tsunami was carried out. Most fault parameters were based on the source mechanism proposed by Aki (1966). Two large rivers, the Shinano and Agano, in the devastated area are vital for determining tsunami devastation, especially the area above the Agano River mouth, where bathymetry data must be extremely precise to calculate the tidal level at the Matsugasaki Station during the event. The model tsunami shows good agreement with tidal records. However, calculated inundation area was underestimated. The ignorance of the remarkable subsidence caused by liquefaction and fountain flow is likely to be one of the main causes of that underestimation. The findings suggest that the subsidence caused by liquefaction should be considered to predict tsunami inundation area. Using both numerical analysis of 1-layer tsunami model and historical records enables us to confirm that tsunami inundation flow make the oil spreading area more extensive in the coastal industrial region. Secondly, we take the 1964 Niigata Earthquake Tsunami as an example, numerical experiments were carried out to apply our 2-layer model. We proposed the processes that oil layer was transported by tsunami inundation flow. The practical issues were clarified by numerical simulation for examples. Keywords: tsunami, 2 layer, oil

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