C. Davison — The Comrie Earthquake. 77 



The shock was an exceedingly slight one. Its intensity was 

 greatest at and near Comrie, but even here it was less than IV, 

 that is to say, it was not strong enough to make doors, windows, 

 etc., generally rattle, though in isolated cases this may have 

 happened. At Comrie it consisted of a slight uninterrupted tremor, 

 lasting two or three seconds, accompanied by a rumbling sound like 

 the passing of a heavy carriage or the discharge of stones from a cart. 



The beginning of the sound preceded that of the shock at 

 Dalchonzie, Easter Ballindalloch and Tomanor ; coincided with it 



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Fig. 1. — Diagram-map of the Comrie Earthquake. 

 at Comrie and possibly also at Bishopsfauld ; and followed it at 

 Eoss. The end of the sound preceded that of the shock at Easter 

 Ballindalloch, and followed it at Bishopsfauld and Boss. 



The broken line on the map indicates the course of the great 

 southern border fault of the Highlands. It has always been 

 customary to associate the Comrie earthquakes with movements 

 taking place along this fault. The evidence, so far, has perhaps 

 hardly been sufficient to amount to a proof of the supposed connexion, 

 but in the present case the position of the disturbed area and the 

 direction of its longer axis seem to me a strong argument in its 

 favour. In the case of so slight a shock, the phenomena are of the 

 simplest possible character, but, so far as I know, there is nothing 

 inconsistent with the view that the earthquake was caused by 

 a slight slip of one of the system of faults taking place in the 

 immediate neighbourhood of Comrie. 



