624 3IK. C. DAVISON ON THE INVERNESS 



north-east of the epicentnim ; and the six places at which the sound 

 followed, or accompanied and followed, the shock are, with the ex- 

 ception of Ardgay, either south-west of the epicentrum or close to it 

 on the north-west side, i. e. just where the intensity is greatest. 



III. Accessory Shocks. 



h. Nov. 15, 18'^ 15'". 

 Intensity. — IV. 



Epicentrum.— Lat. 57° 26' 20" N., long. 4° 15' 20" W., i. e. 3 miles S. 24° W. 

 of Inverness, 



The shock was felt at the following places : Aldourie, Balna- 

 fettack, Beauly, Blackpool of Muistoun (near Inverness), Bunchrew, 

 Clachnaharry, Clunes station, Dores, Drumnadrochit, Fortrose, 

 Glen Urquhart (the schoolhouse), Inchbreeu, Inverness, Kilinuir, 

 Moyhall, lledcastle, Torbreck, and Torness. The earthquake-sound 

 was heard at : Balnafettack, Blackpool of Muistoun, Clunes station, 

 Drumnadrochit, Inchbreen, and Kilmuir; it was also heard at Brin 

 and Invermoriston, but at these places the shock was not felt. At 

 Portrose and Inverness, places where the shock was felt, the sound 

 was not heard. 



JThe disturbed area is 25| miles long and 18| miles broad, and 

 contains about 370 square miles. The longer axis is directed 

 N. 47° E. and S. 47° W. The centre of the area is at a point 

 3 miles S. 24° W. of Inverness. 



The intensity was lY. at Balnafettack, Inverness, and Torbreck, 

 all of tl\em places very near the epicentrum. It was decidedly less 

 than lY. at Aldourie, Clunes station, Dores, Fortrose, and Inch- 

 breen, these being places at a greater distance from the epicentrum. 

 The boundary of the disturbed area is tberefore an isoseismal of in- 

 tensity less than lY., and perhaps not much more than III. 



As to the nature of the shock I know very little. At Inverness 

 the motion was similar to that caused by the first shock, but of 

 much less intensity ; the vertical component of the motion was well 

 marked, and it was upward first and then downward. At Clunes 

 station it was a swaying motion, followed by a trembling. At Glen 

 Urquhart and Beauly only a slight tremor was perceived. The 

 duration of the shock is given at 2 seconds near Inverness and 

 3 seconds at Clachnaharry. 



c. Nov. 16, 9^ 15"\ 

 Intensity. — lY. 



The shock was felt at: Aldourie, Balnafettack, Boleskine, Buuchrew, 

 Cawdor, Clachnaharry, Clunes station, Dores, Inverness, Moy, 

 and Torbreck. The earthquake-sound was heard at Balnafettack, 

 Clachnaharry, and Dores, but not at Aldourie, Clunes station, and 

 Torbreck. At Brin the sound was heard, but the shock was not 

 felt. 



The information is too scanty to enable the boundary of the dis- 



