Gß s. SEKIYÀ 



Notes. 



For reference see corresponding numbers in the tables and in notes. 



No, 1. — This earthquake was moderate in its size being enclosed 

 within the radius of 47 miles. It affords a good example of both 

 horizontal and vertical motions. The maximum horizontal motion 

 occurred at the third second frc^m the commencement of the shock ; 

 at this thne the vertical motion was still exceedingly feeble although 

 it was recoo-nazible from the beç^innino;. It reached its maximum 

 3 seconds later than the horizontal motion which had been then 

 much reduced in its amplitude. The vertical motion was smaller 

 than the horizontal motion in the ratio of 1 to 6 ; its period was 

 quicker in the ratio of 7 to 8 and its duration of motion was shorter 

 in the ratio of 1 to o'3. The direction of the maximum horizontal 

 motion was NNE and SSW while the origin of the earthquake lay 

 in due N from the observing station. 



No. 2. — This shock o-ave the second lar^'est motion recorded 

 in the Table. The horizontal motion was comparatively feeble during 

 the first 20 seconds, but gradually augmented and remained active 

 during 80 seconds. The vertical motion appeared from the beginning 

 but was A^ery small notwithstanding the large horizontal movement 

 that accompanied it. The ratio of the former to the latter was 1 to 

 46 in amplitude, 1 to 4 in period and 1 to o'^ in duration. 



In this and in the f)llowino- shocks it will be observed that the 

 direction of the local movement of the ground at the observing station 

 and the direction of the origin of the shock from the city did not 

 generally coincide. 



No. 3. — This earthquake disturbed the same portion of the 

 country as No. 2, but with less force. The ground moved almost 



