C. Davison — British Earthquakes. 61 



First Shock. 



Time of occurrence, about 4li. 10m. ; Intensity, about Y. 



Very few observations were made on this shock, and I have only 

 met with one detailed account, which I owe to the kindness of a 

 correspondent in Edinburgh. It is impossible, therefore, to deter- 

 mine the boundary and extent of its disturbed area or the position of 

 its epicentrum. 



The only records I possess of this shock are from Edinburgh, 

 Broomieknowe, Penicuik, and Bellsquarry ; and these are all within, 

 and several miles from, the boundary of the disturbed area of the 

 second shock. 



The recorded times of occurrence are : Edinburgh, about 2h., 

 about 4h., and at 4h. lOra. ; Broomieknowe, about 2h. ; Penicuik, 

 about 3h. and about 4h. 50m. ; and Bellsquarry, at 5h. TVIost of 

 these seem to be mere guesses. I have selected 4h. 10m. as probably 

 the most correct time. It was obtained by reference to a clock 

 almost immediately after the event, and was given to me by the 

 correspondent mentioned above, who also estimated the time of the 

 second shock as about 6h. 50m. 



The intensity was probably about V. ; but this estimate must be 

 regarded as doubtful, as it is made from only one observation, and 

 this at a place which may have been some distance from the 

 epicentrum. At Edinburgh, my correspondent informs me, it was 

 strong enough to make the bed rock : "the bed-room door shook, its 

 handle rattled briskly and noisily and forcibly, and the glass above 

 shook also." 



A rumbling sound was heard at the time of the shock at Edinburgh ; 

 and at Broomieknowe a hollow noise was heard, but the shock itself 

 is not recorded as having been felt there. 



Second Shock. 



Time of occurrence, 6h. 53m. ; Intensity, VI. ; Epicentrum, about 

 3 miles W. 42° S. of Balerno. 



Disturbed Area. — The evidence for the study of this earthquake 

 is much more abundant. I have altogether 93 independent observa- 

 tions, made at 53 different places. A large number, however, are 

 from Edinburgh, and the rest, unfortunately, are not very evenly 

 distributed over the disturbed area. On this account, the south-west 

 portion of its boundary can only be drawn approximately. 



An excellent account of the earthquake was given in the 

 "Scotsman" tor the following day, but in this attention was naturally 

 directed chiefly to the places where the more striking phenomena 

 were observed. With hardly an exception, the local newspapers 

 fail to supplement this evidence as regards the limits of the dis- 

 turbance ; and 1 have therefore been obliged to rely principally on 

 the accounts given to me by correspondents, and these, though of 

 great value, are of course not numerous. With reference to the 

 southern purt of the area, however, the case is very different. For 

 all the evidence from this part of the district, I am indebted to the 



