Synthesis of a Tsunami Spectrum in a Semi-Enclosed Basin Using Its Background Spectrum |
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| Authors: | Kuniaki Abe |
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| Institution: | 1. Junior College at Niigata, Nippon Dental University, Hamauracho 1-8, Chuouku, Niigata, 951-8580, Japan
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| Abstract: | We explained spectra of distant tsunamis observed in enclosed basins by applying the synthesis method based on joint analysis of tsunami and background spectra from a number of stations. This method is the generalization of the method proposed by Rabinovich (J. Geopys. Res. 102, 12663-12676, 1997) to separate source and topography effects in recorded tsunami waves. The source function is extracted by inversion of the tsunami/background spectra averaged from many observational sites. The method is applied to the 2009 Papua tsunami observed at the Owase tide station in southwest Japan, a region with complicated topography and numerous bays and inlets. The synthesized spectrum explains the observed spectral amplitudes for each frequency component. It is shown that averaging of tsunami and background from various tide gauge stations in semi-enclosed basins is an efficient approach to extract the source function. |
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