EARTHQUAKE MEASUKEMEXT.S IX PIT AND OX SUKFACE. 2ßo 



X. S. Coiiiponeiit. 



Tn the latter part of the inoticju, the amplitude seems to he Jar"er 

 ill the pit diagram than in the surfaee diau'ram. Dut the period 

 was mueh loiiij'er in the former than in the latter. 



O 



(9.) — Septemher 25th, 1887. — A moderate earthipiake, like the 

 preceding" one. The extent of motion a] »pears to l)e larger in the ])it 

 than on the surface, and consecpiently also the duration of motion 

 is lono-er in the former than on rhe latter. 



E. ^v. Coi 



iipoiicnt. 



