土木学会論文集B2(海岸工学)
Online ISSN : 1883-8944
Print ISSN : 1884-2399
沖合津波観測点配置の違いが逆解析に基づく近地津波予測の精度に与える影響
対馬 弘晃平田 賢治林 豊前田 憲二尾崎 友亮
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68 巻 (2012) 2 号 p. I_211-I_215

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We examined how an array configuration of offshore tsunami stations affects accuracies of near-field tsunami forecasts provided by a tsunami forecast method based on an inversion of the offshore tsunami data. We simulated tsunami forecast of the 2011 Tohoku earthquake assuming several array configurations. As a result, an installation of bottom-pressure gauges to the outer sea of the trench contributes to improving the forecast accuracies, as well as deployment of the gauges at the seafloor between a source and a coastal point where forecasts will be provided. We also examined how rapidly accuracies of tsunami forecasts improve when a dense offshore observation network is installed, and found that the accurate forecasts can be obtained from the data of the dense network 10-15 min earlier than from those of the existing-array configuration.

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