DISTUEBANCES IN THE OCEAN. 



181 



gives us an average rate of about 511 feet per second, 

 These waves were felt all over the Pacific. At the 

 Chatham Islands they rushed in with such violence that 

 whole settlements were destroyed. At the Sandwich 

 Islands the sea oscillated at intervals of ten minutes for 

 three days. 



Comparing this wave with the one of 1877 we see that 

 one reached Hakodate with a velocity of 5 1 1 feet per second, 

 whilst the other travelled the same distance at 512 feet 

 per second. 



An account of this earthquake wave • has been given 

 by F. von Hochstetter (' tlber das Erdbeben in Peru am 13. 

 August 1868 und die dadurch veranlassten Fluthwellen 

 im Pacifischen Ocean,' Sitzungsberichte der Kaiserl. 

 Akademie der Wissenschaften, Wien 58. Bd., 2. Abth. 

 1868). From an epitome of this paper given in ' Peter- 

 mann's Greograph. Mittheil.' 1869, p. 222, I have drawn 

 up the following table of the more important results 

 obtained by F. von Hochstetter. 



The wave is assumed to have originated near Arica. 





Distance 



Time 



Velocity 



Depth of 





sea miies 



taken by 



in feet per 



ocean m 





from Arica 



wave 



second 



feet 



Valdivia . 



1,420 



h. m. 

 6 



479 



7,140 



Chatham Islands 



6,520 



15 19 



608 



11,472 



Lyttleton . 



6,120 



19 18 



533 



8,838 



Newcastle 



7,380 



22 28 



538 



9,006 . 



Apia (Samoa) 



5,760 



16 2 



604 



11,346 



Rapa 



4,057 



11 11 



611 



11,598 



Hilo .... 



5,400 



14 25 



555 



9,568 



Honolulu . 



5,580 



12 37 



746 



17,292 



Calculations on the same disturbance are also given by 

 J. E. Hilgard.i 



Assuming the origin of the wave to have been at Arica, 

 his results are as follows : 



United States Coast Surrey Report^ or Am. Jour. Sci. vi. p. 77. 



