Vol. 58.] INVERNESS EARTHQUAKE OF SEPTEMBER 1901. 379 
there is an isolated record of one in June at Aldourie, and of 
another in July at Dochgarroch. The first to attract general 
notice took place about thirty hours before the principal shock. 
a. September 16th, 6.4 p.m. 
Intensity, 4; epicentre, lat. 57° 24:9'N., long. 4° 185’ W. Number of | 
records 9, from 8 places (Pl. XII). 
The disturbed area is roughly circular in form, about 12 miles in 
diameter, and contains about 108 square miles. Its centre lies 
about 14 miles south of Dochgarroch, and three-quarters of a mile 
on the south-east side of the great fault. The shock was extremely 
slight, the vibrations being hardly perceptible, except at Dochgar- 
roch. Asa rule, the sound was also faint, though more prominent 
than the accompanying tremor. The approximate circularity of the 
disturbed area shows that the focus must have been small, an infer- 
ence which is supported by the comparison of the sound with the 
discharge of cannon.’ 
September 17th, 11 p.w.: Inverness.—A quivering, lasting for 
2 seconds. 
September 18th, 1.15 a.m.: Dochgarroch.—A tremor, accom- 
panied by sound. 
LY. Principat EARTHQUAKE. 
6. September 18th, 1.24 a.m. 
Intensity, 8; centre of Isoseismal 8, lat. 57° 26:8’ N., long. 4° 15:8’ W.’ 
Number of records 710, from 381 places ; and 77 negative records from 68 places. 
Time of occurrence.—For the time of occurrence stated above, 
I am indebted to Dr. Alexander Ross, F.G.S., of Inverness. It seems 
to me the most reliable of all the estimates, for it was observed 
immediately and checked by time-ball (Greenwich mean-time). 
during the following morning. It differs little, moreover, from the 
records given by several station-masters in the immediate neighbour- 
hood of Inverness.” 
Effects of the shock.—In Inverness, the damage to build- 
ings, though never serious, was by no means inconsiderable. One 
brick building used as a smithy collapsed, several chimneys, or parts 
of them, fell, and many chimney-pots were displaced or overthrown. 
+ On September 16th, at 9.30 p.m., a slight shock is said to have been felt at 
Edderton, Fortrose,and Tain. No details are given, and the places of observa- 
tion are so far one from the other and from the main epicentral area, that.it is 
impossible to establish the seismic character of the disturbance, or even to 
regard it as probable. 
* The Rey. A. Henderson informs me that the shock was registered by the 
Ewing seismograph in the Coats Observatory at Paisley, but the time given 
(15 21™ 358 a.m.) appears to me too early. The seismographs at the Ben-Nevis 
and Fort-William observatories and at the Royal Observatory, near Edinburgh, 
were not affected by the shock. 
