EARTHQUAKE MEARüRElMENTS IX PIT AXD OX SURFACE. '261 



(5.) — riiMO 2nt1i. 1SS7.— A small carrtuninkc. 



(().) — Till,.' ?,Otli, 1887.— A very small ('artli.|n:.k.'. 



K. A\\ ( 'i)]ni)Mii('iit : — Almost insiLi'iiiilcanr, the maxiiimm aiiipli- 

 tndo lu'iiiL!,' ii«»l UTcatcr tlian .().") mm, in the surface diaLii-am. and 

 ohscairo in tlic ])ir one. 



X. S. (\)m|)(^iioiit : — ill tlio surface (liaaram, rlic maximum 

 amplifndc is .OH mm., and in tlie pit diaiiram ])r<)l»al)lv n<tt un':il«r 

 lliaii .07) m]ii. 



(7.). -July 2nd, 18S7.— A small eMrlli(inak( 



(8.) — Inly 22nd. 1887.— An cartlKinake of uwruisc oxivui of 

 iiK/tion, but of slow period. The charar-ter of this éartlu|nakc is 

 iiilenvtino'. Inlike mosf oaiilxpiakes, wliieli lu'U'in with (juir-k vil)ra- 

 tions, <his begins very genfly, witli waves of small amplitude aiid oi' 

 ](^/rio- ])eriod. After .about 10 seconds from the start, the motion 

 becomes largei' and irregular, and ripples a])pe;u" superimposed on 

 p"r-incipal undulations. All Ihe irregul.ar \va\elets are t;d"»u|ated. 



