ON THE EAKXHQUAKE AND VOLCANIC PHENOMENA OF JAPAN. 125 

 Average Intensity and Mean Direction of Shock, &c. — continued. 



The principal measurements obtainable from tbe records of seismo- 

 graphs are as follows :— 



1. Tohio. Central Meteorological Station. 



Maximum horizontal motion, N. and S., about 28 mm. Period, 1-4 sec. 



„ „ „ E. and W. > 32 mm. „ 2-5-4:.0 sees. 



„ vertical ,, 31 mm., with period -84 sec, and 4-4 mm. with 



period 2-3 sees. 



2. Tohio. Imperial University. 



Maximum horizontal motion, > 35 mm. Period, 2-0 sees. 

 „ vertical „ 9-5 mm. „ 2-4 sees. 



3. Osaka. 



Maximum liorizontal motion, 30 mm. Period, 1-0 sec. 

 „ vertical „ 8 mm. „ 1-0 sec. 



4. Nagoya. 



Maximum horizontal motion, 

 vertical 



26 mm. Period, 1-3 sec, 

 6-2 mm. ,, 1"5 sec. 



5. Gifu. 



Maximum horizontal motion, 18 mm. Period, 2'0 sees. 

 „ vertical „ > 11-3 mm. „ 0-9 see. 



At the two latter places the records only showed the first half-dozen 

 vibi'ations of the disturbance, after which the buildings fell, and the 

 instruments were buried. 



At several places in the Neo Valley objects like gateposts have 

 apparently shifted their positions by jumping, each leap being from 1 to 

 4 feet. 



Another observation, also due to Mr. Omori, is that the greater 

 number of columns in one district fell in one direction, whilst those in 

 another district fell in some other direction. Thus, in the southern part 

 of the Nagoya-Gifn Plain, on its eastern side, columns fell towards the 

 coast, whilst at towns on the western side of the plain they fell towards 

 the east — an observation which suggests that the movements causing 

 overturning had advanced eastwards and westwards, from a line or tract 

 running north and south down the centre of the plain. In the northern 



