100 



REPORT 1892. 



5. Intensity of Earthqiiakes. 



Of the 101 earthquakes which took place in Tokio in the year 1888, 

 the following are the most notable : — 



The origin of this earthquake must have been somewhere in the Gulf 

 of Tokio. In the provinces on the Gulf river banks gave way, rents were 

 made in walls, articles fell down, liquids flowed from vessels, clocks were 

 stopped, &c. The duration was long. The next shocks of long duration 

 were those which occurred at 61i. 9m. 20s. p.m. on May 12, and at 

 8h. 13m. 33s. on November 3, each having a duration of 1^ minutes. 

 All the remaining shocks had a duration of less than 4 minutes. There 

 was only one earthquake which had a range greater than 10 mm., 8 

 earthquakes which had ranges 1-10 mm., 28 which were less than 1 mm., 

 and the remaining 64 were so feeble that measurement was impossible. 



Prom the preceding facts we may conclude that severe eai'thquakes 

 were few in number this year, about 90 per cent, of them being feeble. 



6. Direction of Earthquakes. 



The principal directions of motion of the 101 earthquakes this year 

 were as follows : — 



Earthquake motion was therefore chiefly E.to "W.,and after that S.E. 

 to N.W. It occurred least in the directions S.S.E. to N.N.W., and 

 S.W.W. to N.E.E., the next being S.S.W. to N.N.E. Besides these, 

 there were 45 feeble earthquakes having unknown directions. 



7. Nature of Eart^lq^^a'kes. 



An earthquake may have a horizontal or vertical motion, 

 motion may be rapid or slow. In the following table we 

 nature of the earthquakes in 1888 : — 



And 

 show 



the 

 the 



