SECONDARY UNDULATIONS OF OCEANIC TIDES. 



93 



Thus the mean velocity of propagation of the sea wave is 

 somewhat greater than the velocities of other waves. The 

 mean value of i^~gh between Sanriku and Honolulu fairly agrees 

 with the observed, while the value between Sanriku and San 

 Francisco is decidedly greater. 



(e) Sea waves of South America, 190G. 



The earthquake of Ecuador originated, in our time, at 

 Qh^.2™ a.m.,1 February 1, 1906, and was accompanied by a 

 sea wave, which traversed across the Pacific from America to 

 Japan. The wave was recorded by the tide-gauges of Hakodate, 

 Ayukawa, Kushimoto, Hososhima and Fukahori (PI. LVI, Fig. 

 1-4 ; PL LVII, Fig. 1). The earthquake of Valparaiso, which 

 was also followed by a sea wave, originated at 9'' 45"' a.m., 

 July 17 in the same year. The wave arrived at Hakodate, 

 Ayukawa, Aburatsubo and Kushimoto (PI. LVII, Fig. 2-3 ; PI. 

 LVIII, Fig. 1-2). In the two waves, the periods observed in 

 these bays were as foUow^s :— 



