ON SEISMOLOGICAL INVESTIGATION. 



203 



No. 98, May 9, 1897. 

 It is remarkable that this earthquake, with two maxima and a 

 motion of 6 mm., does not appear to have been recorded in 

 Europe. I should be inclined to place its origin west of Great Britain. 



range of 



No. 99, May 13, 1897. 



Shide 

 Nicolaiew 



Apparently not recorded in Italy, 

 east of Russia (see No. 97). 



It most likely originated to the 



In 

 12 hrs 

 12 hrs 



No. 100, May 23, 1897. 

 on the above date, a Ion 



g,, slow earthquake was felt 



at 



Tokio, 



23 mins. G.M.T. In Hakodate and Sendai the times given are. 



20 mius. and 12 hrs. The time records render it probable that 

 the origin was nearer to Sendai than to the other places ; whilst the 

 character of the motion recorded in Tokio and Hakodate makes it probable 

 that the focus of the disturbance would be 200 or 300 miles from those 

 places. 



With this assumption the time at the origin, which is likely to be in 

 the Tuscarora Deep, would be about 2 mins. 30 sees, earlier than the Tokio 

 record. The time registers are therefore as follows : — 



It will be observed that the times taken to travel from the origin, 

 with one exception, increase with the distance of the same to the four 

 observing stations. 



From the magnitude of these intervals it is not unlikely that only the 

 maxima phases of motion have been recorded, the preliminary tremors 

 having been so small that they are not shown upon the seismograms. 



Velocity Table. 



No. 101, May 24, 1897. 



Nicolaiew (23rd) 

 Shide . 

 Catania 



Also recorded at other stations in Italy. 



