Vol. 58.] THE INVERNESS EARTHQUAKE OF SEPTEMBER 1901. 317 
24. The Inverness Eartu@uake of SepremBer 18ruH, 1901, and its 
Accessory Suocks. By Caartzs Davison, 8c.D., F.G.S8. (Read 
April 16th, 1902.) 
[Prares XI & XII.] 
1. InrRopvuctrion. 
Tue earthquakes of Inverness and Comrie, though never so strong 
as those of Essex and Hereford, bear, in their long trains of after- 
shocks, a far closer resemblance to the great earthquakes of other 
countries. Since the Comrie earthquake of October 25rd, 1839, 
which was followed by 330 tremors and earth-sounds within little 
more than two years,’ no British earthquake has been attended by 
so many accessory shocks as that which occurred in the neighbour- 
hood of Inverness on September 18th, 1901. The unusual intensity 
of the earthquake, its apparent connection with the great northern 
boundary-fault of the Highlands, and the possibility of tracing 
oscillations in successive centres of disturbance along the fault- 
surface, combined in rendering a detailed investigation desirable.* 
The names of all those who have assisted me are too numerous to 
mention here; but, in offering my best thanks to them collectively, 
I should like to acknowledge my special indebtedness to Mr. W. J. 
Watson, Rector of the Royal Academy, Inverness, Mr. A. 8. Reid, 
F.G.S., of Trinity College, Glenalmond, Mr. 8. Archibald of Dala- 
rossie, and Miss Isabel Forbes of Teanassie, near Beauly, for the 
most useful series of accounts which they have kindly collected. 
Valuable records of after-shocks have also been communicated to 
me by the following gentlemen:—Mr. D. Forsyth (Inverness), 
Mr. James Fraser (Aldourie), Mr. John E. Fraser (Dores), Mr. P. 
Fraser (Holm, near Lentran), Mr. A. Grant (Drumalan, near 
Drumnadrochit), Mr. W. Grant (Invermoriston), Mr. R. Keillar 
(Lochend, Aldourie), Mr. W. Mackenzie (Bunchrew), Lieut.-Colonel 
L. D. Mackinnon and Mr. D. Munro (Dochgarroch), Lieut.-General 
F. W. Peile (Inverness), Mr.,D. A. Rose (Abersky), and the Rev. T. 
Sinton (Dores); while Col. Mackinnon and Mr. D. Munro have 
furnished some interesting notes with regard to the fissure formed 
in the bank of the Caledonian Canal, near Dochgarroch. 
In the following catalogue of earthquakes, I have included no 
records but those made by careful observers. A large number (41) 
of the shocks and earth-sounds rest on the authority of a single 
observer; but, while all are probably of seismic origin, I have dis- 
tinguished by means of prefixed letters and more detailed descriptions, 
those (19 in number) that were noticed by several or many persons. 
In estimating the intensity of the shocks, I have referred as usual 
? J. Drummond, Phil. Mag, vol. xx (1842) pp. 240-47. 
* The expenses of the investigation were defrayed from a grant received from 
the Government Research Fund. 
