津波発生前の大洋の網引

概要

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There are several special places where their bay or estuary oscillates before tidal wave arrives. This undulation is called "Abiki", at the moment when the earthquake generates. The phase difference between the original time of earthquake and initial departure of sea-level is only ±4.081sec, so that if we notice and analyse this fact, we can estimate the arrival time of tidal waves. After this simultaneous wave appears, various sort of succesive wave system follows, whose travelling speeds are, 1512.548m/sec of hydraulic sonar wave, 326.049m/sec of atomospheric sonar wave, and finally 205.654m/sec of Oceanic tidal wave.
社団法人日本船舶海洋工学会の論文
1991-03-29