On the 21st, September 1934 the severest typhoon ever experienced in the world attacked the city of Oosaka. In this district there arose severe damages by the destructive sea wave or tunami. The present author started from the consideration that this sea wave is a phenomenon similar with seiches excited by a travelling disturbance and explained the real states of tunami experienced at Oosaka and its neighbourings considering the form of the bay.
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