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Measurements of seiche were conducted using a portable pressure gauge at heads of bays and ports in the Pacific coast of Shikoku, Japan, and the sea levels at seventeen points were detected from the records of six hours. The dominant periods derived from the spectra show a distribution having a median of 21 minutes with a variation from 8 minutes to 93 minutes. For the 1946 Nankai tsunami the maximum height ratio is defined as a ratio of the maximum height at a bay head to that at an open coast nearest to the bay. The values estimated from old documents at the corresponding bays are plotted as a function of dominant period of seiche. The distribution shows the maximum at a period of 19 minutes. The amplification is explained as a resonance of tsunami having a period of 19 minutes. The value almost agrees with results obtained from tide gauge records of Uchiura and Hosozima, eyewitness information, and tsunami source size. The height ratio of 2 at the resonance period suggests that the Nankai tsunami consists of wave train with a crest and a trough.

Resonance Curve of the 1946 Nankai Tsunami at the Pacific Coast of Shikoku District