Earthquake Measurements of recent 

 years especially relating ^to Vertical Motion. 



S. Sekiya 



Professor of Seismology, Imperial University. 



Thi« paper contain.s the records of earthquake observations made 

 during the two years from September 1885 to September 1887. 

 Severe shocks as well as feeble tremors are arranged in the accom- 

 panying table, and in some shocks separate notes are added by way 

 of fuller description. The measurements were made at two places in 

 Tokyo ; one set at Hitotsubashi where the ground is soft and marshy, 

 and the other set at Hongö where the soil is hardened alluvial mud. 



Vertical motion which forms the principal subject in this paper 

 has not hitherto been so much studied as horizontal motion. This is 

 on account of its comparatively rare occurrence, and when it occurs 

 its smallness makes it of secondary importance to the more prominent 

 horizontal movement. Reference will be made to Plates IX, XI and 

 XXYI, Vol, I. of this Journal, in which the characteristic features of 

 vertical motion occurring in conjunction with horizontal motion can 

 be seen. 



In this country aljsolute vertical motion ^ was first measured 

 by Mr. E. Knipping between 1878 and 1880. During that period 



1 Mittheilungen der Deutschen Gesellschaft, etc. Ostasiens Vol. 17, May 1879 and 

 Transactions of the Seismological Society of Japan Vol. I. p. 72. 



