Near-field tsunami amplification factors in the Kii Peninsula, Japan for Dense Oceanfloor Network for Earthquakes and Tsunamis (DONET)
We investigated the correlation between coastal and offshore tsunami heights by using data from the Dense Oceanfloor Network for Earthquakes and Tsunamis (DONET) observational array of ocean-bottom pressure gauges in the Nankai trough off the Kii Peninsula, Japan. For near-field earthquakes, hydrostatic pressure changes may not accurately indicate sea surface fluctuations, because ocean-bottom pressure gauges are simultaneously displaced by crustal deformation due to faulting. To avoid this problem, we focused on the average waveform of the absolute value of the hydrostatic pressure changes recorded at all the DONET stations during a tsunami. We conducted a Monte Carlo tsunami simulation that revealed a clear relationship between the average waveforms of DONET and tsunami heights at the coast. This result indicates the possibility of accurate real-time prediction of tsunamis by use of arrays of ocean-bottom pressure gauges.
KeywordsTsunami early prediction Cabled seafloor observatory DONET Nankai trough
We thank Dr. Shu-Kun Hsu for editing and two anonymous reviewers for their careful reviews of this paper. We also thank Dr. Fumihiko Imamura and Mr. Masayuki Okuno for providing the digital elevation model data for the Owase and Kumano regions. The 2011 Tohoku tsunami data for the GPS buoy were provided by the Ministry of Land, Infrastructure, Transport and Tourism, and tide-gauge data from the tsunami were provided by the Japan Meteorological Agency. This study was partially supported by SATREPS (Science and Technology Research Partnership for Sustainable Development).
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