90 K. HONDA, T. TERADA, Y. YOSHIDA, AND D. ISITANI. 



The period of 86"" may be accounted for, if it be attributed 

 to the binodal seiches of the enclosed basin. 



(5) Lyttelton, New Zealand. PI. LTII, Fig, 1. 



Very conspicuous oscillation of this port with tlie unusually 

 long period of 165™ is probably due to the Pegasus Bay. 

 Taking the node between Table Island and the end of Bank 

 Peninsula, the calculated mean depth is about 30m. which seems 

 allowable. On the other liand, if we suppose the period due 

 to tlie oscillation in the narrow inlet of L^^ttelton, the calculated 

 mean depth would only be 8 m. 



(G) Honolulu, Hawai. PI. LIII, Fig. 2. 



Taking /= 2.25 km. for the narrow inlet and T—27.7"\ we 

 obtain h=o.7m, which seems reasonable. Another conspicuous 

 period is probably due to the binodal oscillation of the inlet. 



(7) San Francisco. PI. LIII, Fig. 3. 



The conspicuous periods of the Krakatoa waves observed 

 in the bay were 24.0", 36.2" and 48.6'". These periods were 

 frequently found in the same bay for other sea waves, and as 

 we have already remarked, probably correspond to the multi- 

 nodal seiches between the West Berkeley and Sausahto sides. 



{d) Sea wave of Sanriku, 1896. 



On June 15, 1896, a destructive sea wave originated in a 

 distance of about 150 km. off the coast of Sanriku in Japan. 

 The wave was the most disastrous one in modern time ; its 

 lieight in Yoshihama even amounted to 24 m. It swept away 

 many towns and villages along the coast line of Sanriku, ex- 

 tending to about 320 km. ; 22,000 lives were lost. 



At Miyako in Rikuchiu, the earthquake was felt at 7'' 32" 

 p.m. and the tide began to retire at about 7'\50'" ; it then in- 

 creased and attained a maximum at about 8^ Then it decreased 



